I have severe vomitting and diarreah. It comes on with no notice, every few weeks and lasts 24-72 hours. During these boughts of illness, I have no abnormal temp, no chills or body aches, nothing else that would indicate a flu or stomach virus. This probably describes a gazillion possible causes, and I have more info but want to start with this, as last two times, I ve almost and probably should have gone to ER due to dehydration and the lack of ability to even keep sips of water and/or gingerale inside of me.