Well, usually, when weight gain is that severe the doctor tries a different med, but docs are often pretty clueless and these drugs aren't that easy to stop or to find ones that work. But just because a drug is a weight gainer, that doesn't mean you're helpless to change the way you eat. It is harder, yes, but it can be done. Look up a book called the Anti-Depressant Survival Guide -- the diet in it isn't the best, but it does give you an indication of what a type of psychiatrist who call themselves functional physicians approach this type of problem. Good luck.