Your on meds that have the side effect of weight gain for "many people"
Meds:
600 seroquel,
1200 Triliptal, 300 lamictal, 20 prozac, 150 wellbutrin, .5 Klonopin, 300mg x3
Gabapentin.
Is your Bipolar stable and are you staying at baseline and enjoying life? If not.. Then its very possible your just on too many meds. Often Pdoc's layer one med on top of the other in the quest for helping a patient. But sometimes a person is simply on too many medications at one time.
I personally would ask my Pdoc about doing a med review and see if you indeed need that many meds daily.
I deal with Anorexia and weight gain was always a NO way for me as that would swirl me into a hellish anorexic episode.
When I was taking meds the only ones that were true weight neutral were Invega and Haldol.
I hope you can find a solution, One should not have to accept being over weight that will cause physical problems just to stay mentally more stable.
Be your own Best advocate.