Gynecomastia and mastalgia (the pain and tenderness generally caused by gynecomastia) can be caused by a number of issues other than exogenous androgens. Are you on any other medications or drugs? Cimetidine (Tagamet - H2-Antagonist for heartburn and ulcers), omeprazole (Prilosec - another antacid but via proton pump inhibition), spironolactone (Spiroton among others, used for hypokalemia and some heart issues), cancer treatment drugs, finasteride (assume you all know this one), as well as some antipsychotics and anti depressants all can cause both gynecomastia and mastalgia. However, it could obviously be due to your known androgen use as well, just thought I would mention the others incase you just began a regimen.
First, tell your doctor that if he isn't going to help you to please give you a referral to an endocrinologist. Explain to him exactly what you have done, and that SERMs and/or AIs are the standard treatment for hyperandrogenically induced (and most other non pseudo) gynecomastia. If he would like more information, ask him/her to check these findings:
Feel free to print this out for him/her.
http://www.ncbi.nlm.nih.gov/pubmed/14759718"Management of physiological gynaecomastia with tamoxifen."
http://www.ncbi.nlm.nih.gov/pubmed/15998589"The role of tamoxifen in the management of gynaecomastia."
http://www.ncbi.nlm.nih.gov/pubmed/15238910"Beneficial effects of raloxifene and tamoxifen in the treatment of pubertal gynecomastia."
http://www.ncbi.nlm.nih.gov/pubmed/10763958"Treatment of mastalgia with tamoxifen in male patients with liver cirrhosis"
http://www.ncbi.nlm.nih.gov/pubmed/18655526"Long term look on adolescene treated with tamoxifen for gynecomastia"
http://www.ncbi.nlm.nih.gov/pubmed/12662229"How should gynaecomastia be managed?" - *NOTE I don't recommend the use of Danazol for gynecomstia treatment due to it's mode of action, it has more adverse effects than Tamoxifen (or AIs such as exemestane, anastrozole, letrozole for that matter).
I hope that helps, if you or your doctor have any questions feel free to ask more or PM me.