Hi, I have OCD and I have weight issues, but they aren't the same as yours! But I do obsess over the fact that I think I'm fat. Only about a month ago I weighed 125(I'm only 5'1"). I had a good body, but that was still thick compared
to what I'm used to.(about 110). Anyways I just found out a couple of days ago I'm 150?!?! Honestly, I didn't even notice all that weight I had put on. In fact, I've been telling people I weighed 125, because I simply didn't think that has happened! Anyways the two days I was on Zoloft I lost 4 pounds. Then I got taken off, and now I'm eating like crazy. I can't seem to make myself diet and I feel like I'm always hungry. Idk if it has anything to do with my OCD, though. Honestly I think it's more like comfort food to cope with my anxiety. I'm not really sure. I do know if I don't shed some weight my anxiety won't get any better though. I wish you luck with weight gain.
Much love and God bless