In the middle of the night, I experienced terrible pain in the upper part of my stomach. All day, I had been burping an awful rotten egg taste. About three this morning, I began to violently dry heave, like my body was trying to pull something from the place where my stomach was knotted and painful. I also had bad diarrhea. I m a teacher, and I experience stomach bugs about twice a year, but this was violent and unlike any other. I almost called an ambulance for fear that whatever my body was tying to bring up would get stuck in my throat and choke me. I was okay most of the day today, but now the rotten egg burps have begun again.