I have been on and off antidepressants for years. About two years ago I have been on welbutrin and loved it but unfortunately had a seizure. Took a break for awhile and decided to go back on some thing so tried zoloft. Proceeded to gain 40lbs quickly that will not come off! I eat amd excercise well! It's been about six months being on nothing and I feel like its time again. I was perscribed lexapro but am so nervous. My previous weight gain consumes me. What should I do?