I think you are on the wrong combination,
Abilify and many other drugs risk weight gain, BUT you have the ability to watch what you eat
and take control of that. I'm on Seroquel for the anxiety, Depakote sorta for both MS -including hypomania and Lamctil for Depression, it's a good combo. I haven't gained any weight, since going off LIthium. At first I was hungry all the time, but one day I just stopped, I have no idea why, but I'm not complaining.