Does anyone else suffer from severe rapid onset diarrhea, vomitting, and severe pain in the left lower bowel/pelvic area right before or during monthly period? It usually happens the day before or the day after I start my period. I suddenly get violently sick to my stomach and violent diarrhea, so dizzy and weak that I can't get up and the pain is like severe labor pains! It's a horrible thing to go through every month and the docs don't seem to have a clue. It started at exactly the same time as my thyroid problem. Please help!