I had that problem for a couple years, and it ended sometime last year. A doc mentioned bulimia but I never got an actual diagnosis besides IBS. I was throwing up after almost any meal, for a few weeks, then ok for a while, on and off. I don't think I fear getting fat, but maybe thats there in the subconscious. Test for gastroparesis was negative, had gall bladder out but it took 2 years after that for problems to go away. So its kind of hard to tell. I had food coming back up that was 8 hours old. It was voluntary emesis, but I sorta had no choice, it wasn't going past the stomach area, just sitting there. It will still flare up on the occasional odd day. I stopped eating dairy and that seems to help a little.
I would eat complusively, its some kind of OCD.
Am finally getting treatment for OCD, anxiety, major depression, etc: Syrabyax. It makes me hungrier and so far about 3 weeks into it no major weight gain yet. Am monitoring blood sugar and weight every day. Mentally I feel better and can function again, major depression is parayzing. My gastro had suggested anitdepressants a few years ago and it took me a long time to decide to see pschrinks.
Syrabyax is a corabo of 2 often used drugs olanzapine and fluoxetine (Zyprexa and Prozac). Its like $10 a pill but its a good corabination. It would be wonderful for anorexia, as people do gain weight, and apparently it works for complusive eating too, I am only stuffed cause its the holidays, I no longer feel as compelled to eat, just hungry, if that makes any sense. Food is more enjoyable instead of being an addiction. Coffee is still an addiction for me. I am working on staying sober thats hard enough for now.