Started to have episodes 1 year ago. All of a sudden for no reason my palms of my hands will start to itch, then my feet and then my whole body. From here I start to feel flushed and end up in the bathroom vomiting and diarrhea violently for several hours. At some point I usually pass out on floor of bathroom and when I wake up I crawl into bed, go to sleep, and wake up feeling fine but tired. These were about once a month until February when they became more frequent. can happen 3 or 4 times in month now, never know when though just happen for not particular reason