Hi there! I just got a prescription for Prozac because I was also concerned with weight gain. I gained weight on Cyrabalta in the past. Luckily it was just 5 pounRAB but I was literally drinking only protein shakes and working out a lot to NOT gain more weight. After I stopped taking it, I lost weight very quickly without much difficulty, so I know it was the Cyrabalta.
Anyway, my doctor told me that many of her patients lost weight on Prozac and only a few had gained, mostly because an increase of appetite, thus, eating more. I am hoping it all goes well! I am starting on a low dosage for now. I am also taking Xanax on an as-needed basis. Since I am not taking it regularly each day, it shouldn't cause weight gain. This one is more for anxiety/panic attacks at stressful times, and I'll take the Prozac to help calm me down overall.