Burping relieves the pressure from gas. Pressure in the right spot can make one feel sick to the stomach. The fact that burping makes you feel better isn't a sufficient help with a diagnosis. An endoscope and checking for infections in the stomach can help rule out many things. If they both come back negative, then it could be diet related and possibly Celiac's, although Celiac's will usually carry intestinal reactions too. Almost anything that's irritating to your stomach can have similar symptoms. Anxiety will add to the feelings of nausea or even cause nausea, and it's understandable that you'd be anxious given your history. You really need a good diagnosis.
I have not had an endoscope. Celiac's disease sounds like it could be a good possibility. I have some of the symptoms. I read it can cause anemia, which may explain my chest pain and passing out episodes. Would this explain why burping frequently makes me feel better?
This does not sound "mental" to me, although it will start to play with your mind. You said you had a colonoscopy but did you have an endoscope. Also, read up on Celiac's disease and see if that sounds like something familiar. You need a really good gastroenterologist who is a good diagnostician. Hang in there.
Some more info: I've been burping a lot lately. I feel like my stomach is always bloated. Going to the bathroom and burping make me feel a little better usually. 2 summers ago I saw a cardiologist after I experienced some pretty intense chest pain, I thought i was having a heart attack. They did tests, ekg, holter monitor, stress test, found nothing.
I really have no idea what it could be but i think it may be gas related or some type of acid reflux? I have no idea. Im getting blood work done friday to check my thyroid.
I just wish I knew what was wrong with me.