I suffer from constant belching, worse after meals. Everytime I eat I feel nausea and the need to have a good burp, and then I belch really loudly for about a half hour until eventually I vomit. I continue to belch afterwards, but the nausea has subsided. Can anyone help? I'm too embarrassed to go to the doctor and I hardly ever go out now as I know I'll just burp all the time. Could it be a food allergy?