so with you on the weight gain... it took a long time for me to get a good meds balance, I'm still struggling a little with weight due to the Lithium but with effort I can stay not to big. I really think you need to discuss a med change. Every doctors appt when I was playing with meds would be about side effects then how well it was working. So if you are having severe side effects then I would suggest a change. Abilify and Zylis are both weight neutral antipsychotics with great mood stabilising effects, Lamotrigine is an anticonvulsant with mood stabilising and antidepressant effects. Alternatively he may be able to prescribe something to keep your weight down...
All the best for the doctors..