I had a gastric bypass 4 and a half months ago. I was exposed to a gastroenteritis type illness over the weekend, and I now have explosive diarrhea, abdominal pain, malaise, fatigue, and nausea. I know that it is very easy for me to get dehydrated when I do not have diarrhea, if I don t get enough fluids during the day. After how many episodes of diarrhea do I need to head to the ER to be checked for dehydration?