Always have a stomach ache kind of like hunger pains

I'm not a doctor but I am a nurse and all I can tell you is that you should seriously be checked out by a doctor, given your symptoms.  That's absolutely the ONLY way you're going to figure out what's going on.   Good luck.

Could be quite serious if your losing alot of weight, don't wait around here for fixes your first priority should be to see a doctor and have some tests done.