About 3 times a year I experience severe, excrutiating abdominal pain. I feel like I need to have a bowel movement. I also feel like I am going to vomit, I feel like I am so hot,dry mouth, sweating. Also like I am going to faint. When I am finished using the bathroom, I feel better, tired. Then I usually have to go again soon after and it is only muscusy, blood. I just had a colonoscopy in June. What could it be? Thank you.