I have listed all the endocrinologists who have an interest in reproductive endocrinology (the area that best covers the interest of gynecomastia) found via a seach at the AACE (American Association of Clinical Endocrinologists) link below.
You would need to phone around and make enquires but you should be able to get an appointment much sooner than you have mentioned.
NOTE: You should request a copy of all your hormone pathology and reference ranges so that you can view them at your leisure and so you can post them on the site for an independent layman’s opinion.  I am one person who has a hormone condition and who could take a look at any results you may have,
Anyway here you go……
http://www.aace.com/resources/memsearch.php?action=doSrchMotaz Agabani, MD, FACE
2650 Bahia Vista St Ste 104
Sarasota, FL 34239-2611
Directions to Office
Phone: (941) 330-8355
Interest Areas:
    Diabetes Mellitus
    Disease of Pregnancy
    General Endocrinology and Metabolism
    Lipid Disorders
    Nutrition
    Reproductive Endocrinology
    Thyroid Dysfunction
    Other
    PCOS    
Denise Rachele Armellini, MD
1450 NW 10 Av
Room 3054, (D-110)
Miami, FL 33136
Directions to Office
Phone: 3052775600 pager
Interest Areas:
    Lipid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction    
Salwa Salama Ayad, MD
3550 University Blvd., Suite 301
Jacksonville, FL 32216
Directions to Office
Phone: (904) 384-2240
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Lipid Disorders
    Nutrition
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Mohammad M. Baig, MD, FACE
3226 Cove Bend Dr.
Tampa, FL 33613-2752
Directions to Office
Phone: (813) 977-0778
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Ectopic Endocrine Syndromes
    General Endocrinology and Metabolism
    Growth Disorders/Growth Hormone
    Hypertension
    Lipid Disorders
    Metabolic Bone Disorders
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Other
    Osteoporosis    
Judy Barzey, MD, FACE
7401 N. University Drive Suite 105
Pamarac, FL 33321
Directions to Office
Phone: (954) 722-0130
Interest Areas:
    Reproductive Endocrinology    
Amy Bui, MD
P.O. Box 100226
Gainesville, FL 32610
Directions to Office
Phone: (352) 392-2612
Interest Areas:
    Adrenal Disorders
    General Endocrinology and Metabolism
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction    
Misha Denham, DO
Dept of Medicine, Div. of Endocrinology
PO Box 016960 (D-110)
Miami, FL 33101
Directions to Office
Phone: (305) 750-0519
Interest Areas:
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction    
Gary Williams DeVane, MD, FACE
3435 Pinehurst Ave
Orlando, FL 32804-4049
Directions to Office
Phone: (407) 740-0909
Interest Areas:
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Pituitary Disorders
    Reproductive Endocrinology
    Other
    Osteoporosis    
Allan L. Fedosky, MD
Access Medical Group, P.A.
PO Box 5008
Niceville, FL 32578-5008
Directions to Office
Phone: (850) 897-1824
Interest Areas:
    Adrenal Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction    
Renee Freedman, MD
1500 NW 10th Avenue
Suite 205
Boca Raton, FL 33486
Directions to Office
Phone: 561-391-1085
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Obesity
    Reproductive Endocrinology
    Other
Kenneth Mark Gelman, MD, FACE
Reproductive Endocrinology
9900 Sterling Rd. Suite 300
Cooper City, FL 33024
Directions to Office
Phone: (954) 432-2228
Interest Areas:
    Reproductive Endocrinology    
Jennifer Shana Glueck, MD
1450 NW 10th Avenue
Miami, FL 33136
Directions to Office
Phone: (305) 243-6146
Interest Areas:
    General Endocrinology and Metabolism
    Obesity
    Reproductive Endocrinology
    PCOS
    Menopause    
Neil F. Goodman, MD, FACE
9150 SW 87th Ave Ste 210
Miami, FL 33176-2313
Directions to Office
Phone: (305) 595-6855
Interest Areas:
    Reproductive Endocrinology
    PCOS    
John J. Janick, MD, FACP, FACE
4369 Tamiami Trl
Port Charlotte, FL 33980-2118
Directions to Office
Phone: (941) 629-3366
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Disease of Pregnancy
    Ectopic Endocrine Syndromes
    General Endocrinology and Metabolism
    Geriatrics
    Growth Disorders/Growth Hormone
    Hypertension
    Lipid Disorders
    Metabolic Bone Disorders
    Nutrition
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis
    PCOS    
Yiechul Jack Jung, MD, FACP, FACE
12908 Eagles Entry Dr.
Odessa, FL 33556-2839
Directions to Office
Phone: (813) 792-5309
Interest Areas:
    Diabetes Mellitus
    Ectopic Endocrine Syndromes
    General Endocrinology and Metabolism
    Hypertension
    Lipid Disorders
    Metabolic Bone Disorders
    Nutrition
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Edwin N. Lee, MD, FACE
601 1st St N
Winter Haven, FL 33881-4129
Directions to Office
Phone: (863) 294-0670
Interest Areas:
    Metabolic Bone Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Other    
Lusiana Loman, MD, FACE
14100 Fivay Rd Ste 250
Hudson, FL 34667-7151
Directions to Office
Phone: (727) 869-7822
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Ectopic Endocrine Syndromes
    General Endocrinology and Metabolism
    Growth Disorders/Growth Hormone
    Lipid Disorders
    Metabolic Bone Disorders
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Jennifer Byrne Marks, MD, FACP, FACE
PO Box 16960
D-110
Miami, FL 33101-6960
Directions to Office
Phone: (305) 243-6433
Interest Areas:
    Diabetes Mellitus
    Hypertension
    Reproductive Endocrinology
    PCOS    
Govindan P. Nair, MD
4820 5th Ave N
Saint Petersburg, FL 33713-7218
Directions to Office
Phone: (727) 321-6768
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Hypertension
    Lipid Disorders
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    PCOS    
Jesus B. Perez, MD, FACE
Intercoastal Medical Group Inc. Sec Endoc.
30033 Cattlemen Dr. Suite 210
Sarasota, FL 34232
Directions to Office
Phone: (941) 371-3337
Interest Areas:
    Diabetes Mellitus
    Metabolic Bone Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Other
    PCOS
Julio C. Pita, Jr., MD
3659 S Miami Ave Ste 6008
Miami, FL 33133-4225
Directions to Office
Phone: (305) 854-5432
Interest Areas:
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Growth Disorders/Growth Hormone
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Luz Marina Prieto, MD
1450 NW 10 Ave
Miami, FL 33136
Directions to Office
Phone: (305) 243-7316
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Andrew J. Scoma, MD, FACE
1925 Mizell Ave Ste 201
Winter Park, FL 32792-4155
Directions to Office
Phone: (407) 628-0448
Interest Areas:
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Hypertension
    Reproductive Endocrinology
    Thyroid Dysfunction
    PCOS    
Leonard Mark Thaler, MD, FACE
21097 NE 27 Court
Suite 300
Aventura, FL 33180
Directions to Office
Phone: (305) 937-3000
Interest Areas:
    Adrenal Disorders
    General Endocrinology and Metabolism
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Osteoporosis    
Mark P. Trolice, MD, FACE
5931 Brick Court
Winter Park, FL 32792-9411
Directions to Office
Phone: (407) 672-1106
Interest Areas:
    Reproductive Endocrinology
    Other
    PCOS    
Juan Carlos Varon, MD
University of Miami, Dept of Med, Div of Endo.
Post Office Box 016960
Miami, FL 33101
Directions to Office
Phone: (305) 243-6146
Interest Areas:
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction    
Arnold Vera, MD, MSc, CDE, FACE
Vera Endocrine Associates
1667 N. Clyde Morris Blvd. Suite 2
Daytona Beach, FL 33204
Directions to Office
Phone: (386) 274-1414
Interest Areas:
    Adrenal Disorders
    Diabetes Mellitus
    General Endocrinology and Metabolism
    Hypertension
    Lipid Disorders
    Metabolic Bone Disorders
    Nutrition
    Parathyroid Disorders
    Pituitary Disorders
    Reproductive Endocrinology
    Thyroid Dysfunction
    Other
    Osteoporosis
    PCOS