Have you considered metformin for weight loss? I havn't personally tried it but i know a few ppl take it with psych meds to combat the weight gain. I get your frustration of being on so many meds. I wake up every morning and first thing I do is pop meds. And again at night. And again before bed. It sucks. I agree with everyone else when they say to talk to pdoc.

Dx: BP2, PTSD, bulimia/anorexia
Seroquel 150mgs
Risperdal 4mg
Trileptal 600mgs
Buspar 45mgs
Ativan 1mg PRN
Vyvance 70mgs PRN