Several times a day I get "air" in my belly. Just all of a sudden I feel like I'm gona vomit and at the same time feel like gotta burp extremely bad. If someones around me I will have them pat me on the back until I burp. Sometimes it last up to 20 minutes. The instant I belch everything goes away, but it has to be that certain burp or it just makes it hurt worse. I don't have insurance so I can't afford to go to some specialist. Wondering what this is or what causes it so I can avoid doing it, and if there is any OTC meds that I can take? I've already taken every antacid, heartburn medicine I can think of and nothing is helping.