I had these same symptoms. Unfortunately I had several things going on, all of which had similar symptoms. I still experience the stomach cramps and burping followed by vomiting (most often without nausea though) The first thing was my gall bladder shutting down but that will also cause heart burt and pain just under the ribs on the right side. My problem resolved for a period of time but them came back just not as bad. The next problem they discovered was gastritis which later developed into an ulcer. This will cause all of those symptoms as well. How old are you and how long has this been going on?