Hello Is:
I took Paxil (SSRI) for 6 months 17 years ago and gained 50 pounds. I was able to lose it by going completely off of antidepressants and doing the low carb "Atkins Diet". I did try Wellbutrin a few years ago after I began to gain weight, I didn't lose any weight, and I became sort of "twitchy" when I was taking it, so I quit. Maybe the twitching burns calories and I would have lost weight had I stayed with it!
I have taken many different antidepressants over the years, but none of them have impacted my weight the way Paxil did. I am in my mid-fifties now, and the Atkins Diet no longer works for me. I lose weight, but become so exhausted that I can't even climb a flight of stairs. This has happened the last three times I've tried it. I know that I have an untreated underlying depression, but I also know that throwing a pill at it hasn't helped me. I've been on Pamelor, Paxil, Zoloft and Wellbutrin. I've also been on Xanax and Ativan for anxiety on and off. I am not taking any medication now and am determined to fight the good fight by the grace of God. I know binge eating has been my way to throw food at depression and anxiety. I have found that walking and eating a whole food type diet, as well as reading the bible and other Christian literature has helped my depression and anxiety more in the past than any medication did. I am considering trying 5-htp, vitamin D and fish oil supplements. 5-htp is supposed to help with binge cravings. Someone at work saw it on Dr. Oz and told me about it. I'm skeptical of supplements since they aren't regulated by the FDA, but I am leaning that way.
So, that is my story. I'm certainly not encouraging you to stop your Wellbutrin. Just sharing my own experience. My husband took it once in an effort to quit smoking, as it is marketed for that as well. Oddly enough, he told me one day, "you know, honey, I just don't want Mountain Dew anymore" (he drank a 12 pack a day for years and years), but it didn't do a thing for his smoking!
Good luck and God bless!