I am hoping someone else out there has heard of this and can give me some guidance. I get severe fatigue after a bowel movement, and when it happens, the severe fatigue lasts all day (I am destroyed and can't do anything, almost like a severe hang over). It does not happen all the time- it will happen every day for a week or two, then it will disappear for months with no symptoms. The severe fatigue only occurs right after a bowel movement. I can wake up just fine and function normally for a hour or so before my bowel movement, then I'm completely wiped out for the rest of the day once I go. There is nothing special about my poop- it is not particularly hard or soft, it is not liquidy, there is a normal amount coming out (not too much, not too little), it is normal poop color. My bowel movements are not painful and, I can't stress this enough, I AM NOT straining to go or pushing too hard. I have no idea why it happens or why it goes away- I am not doing or eating anything different. My gastro-intestinal doctor doesn't have a clue what's wrong, and he said he's never heard of this symptom before. I have a camera look at my stomach (not during an episode, however) and it appears normal. Does anyone out there have this problem or can give me a guidance on where I should look for answers?