Weight loss after ati-depressant weight gain...can it happen

I'v been on meds for ten years. All different meds. I'm 34 years old and right now I'm on abiify (like .5 mg), wlbutrin and lamictal. I'm off the zoloft now, but i ned to lose 15 lbs because I a soooo unhppy with my weight! I'm 5 feettall and have always been 100 lbs and I just look thick and gross. I started jenny Craig five days ago and I swear I doon't think it's working. Aso, I'm wondering if the abilify and the welbutrin will help with my weigt loss as well...I've been on welbutrin for quite a while and beause I was alsoon zoloft it did not make me lose anything. Immiserable!!! Anyone have any advice?