Got severe abdominal cramps, diaherrea. I thought I just had flu or food poison. Diaherrea quit, next morning just blood came out in toilet. Went to emergency. Blood test all came back pretty normal, went to restroom there and was just geled blood. They took sample, tested was negative for e coli, etc. Much discomfort in left lower back and abdomen. 2 days after leaving hospital still a lot of blood in stools and pain. Had a colonoscopy 7 months ago. 1 pre cancer polyp removed but everything else was good. What is wrong with me. The Doctor at the emergency room took no test, just said it is probably a bleed from a major artery or vein from a diverticulae and put me on 3 days of antibiotics. How does he know without any test? I'm really scared. I'm 55 years old. I am going to try to get into my GI doctor, but it's so hard to get in fast. All this pain and blood is scaring me big time.