Nausea and vomiting on and off for over a year

Hello all, never done this before but I'm just about at my wits end. Around 4 years ago I tested positive for H-pylori which then led to a mis-diagnosis for a bleeding peptic ulcer. I was put on all kinds of medications to treat this ulcer that wasn't there and since then my stomach has never been the same. I get nausea almost any time I eat. A little over a year ago the vomiting started. I went a solid 6 months of throwing up everyday, often even multiple times a day. I will go a few weeks or months feeling ok but then it comes back. I am dizzy and fatigued almost all the time. My joints hurt badly and I experience hot flashes. I am only 22, I work at a natural food and supplement store so my world is revolved around eating healthy and being healthy. I exercise  almost daily and I can't seem to figure out what is wrong with me. I have tried to eliminate foods but nothing seems to work long term. I have noticed that a lot of what I'm vomiting up is oils and I have an extremely hard time digesting animal fats, makes me sick almost instantly (so I've deleted meat). more recently now I have also been experiencing bad gas (embarrassing, but it is what it is) and then interchanges between constipation and diarrhea. I have spent more money than I could ever imagine trying to figure this out and i have now lost faith in western doctors. Could this possibly be hepatitis? Or any other possible ideas? I am so tired of being in pain and running back and forth to the bathroom and work and at home to puke. Anything helps!! thanks