I began weaning off of zoloft a month and a half ago. I went from 100 mg down to 25 mg. When I got down to 25 mg the withdrawal became so bad that I would wake up every morning trembling, with diarrhea, naseau, and anxiety. I have lost 12 lbs. I have no appetite. I then switched to 10 mg of celexa. I am having severe headaches, confusion, dizziness, tremors, naseau, lack of appetite and diarrhea. I have only been on the celexa for 5 days. I am also having lots of muscle pain. Am I still withdrawing from the zoloft or am I having serotonin syndrome? I have been on antidepressants for 13 years and should have weaned much slower. Thanks for your help. This has been going on for weeks now.