I sometimes get this weird feeling like I have air trapped in my chest. it feels as if I need to belch to relieve the tightness but it never happens, so I try to make myself belch to clear the discomfort. it doesnt hurt, but I have this full feeling and it causes me not to eat sometimes for fear that food will somehow get trapped, even though I know that's silly. This discomfort can last for days and I wake up in the same condition. I saw an internist last year who tried to tell me its from eating to fast but nothing has changed? any ideas?