Go In Now: Blood in the stool is a reason to get prompt medical evaluation. Also, if you have a gastrointestinal bug which causes bloody stools, again is a reason to go in for an evaluation. Only a few causes of gastroenteritis have bloody stool as a finding and may need antibiotics. Lightheadedness/almost passing out could represent blood loss, or more commonly significant dehydration.
Answered 4/24/2017
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