I just recently stopped taking Effexor and noticed that I did, in fact, have a much harder time losing weight than now! I never had my thyroid checked out like IBelieveInMe2, but maybe her advice would work! If anything, possibly switching to a different SNRI would work also, though I don't really recomend it. I wish you the best of luck!
We are each our own devil, and we make this world our he l l- Oscar Wilde
Opps! Do over! teehee!