Bulimic people have clinically important gastroenterological disease processes, that require specific diagnosis and treatment independent of the psychiatric treatment.
It seem like you are experiencing symptoms of gastroparesis or delayed stomach emptying, common complain in bulimic patients.
Its typical symptoms are nausea, vomiting, bloating, weight loss, feeling of fullness after only a small amount of food is eaten, stomach and upper abdominal pain, heartburn.
Other symptoms consistent with gastroparesis are flatus, constipation and diarrhea.
Belching is expelling the excessive swollen air, usually, happening when food and liquids, are consumed in large quantities and very fast.
Flatus and diarrhea, usually result from some type of food that isn't digested completely in large intestines (differences in colonic flora and motility play role, too).
Abdominal bloating is very characteristic for bulimic patient due to gastroparesis and because it is believed that bulimic people have hypersensitive bowel and they misperceive the amount of gas as too much.

Visit physician specialized in treating gastrointestinal disorders!

Thank you very much. In my research I did come across gastroparesis but skimmed past it because I was concentrating on an intestinal etiology. however I went and really read gastroparesis after your suggestion and I think this could be it. I think I should organise now to go either to a gp first then specialist or directly to a specialist. are you a doctor, nurse or former bulimic?