Ive had left upper quadrant pain over a month. Ultrasound normal..GI doc wants colonoscopy...the area is tender when he palpated. He said its in the area of the splenic flexure. I have now diagnosed my self with the worst. At first no real big changes in bowel movements, now I am trying to be more aware- I noticed looser stools. Other day almost diarrhea. I have been under a lot of stress as well, just lost my Father.
I am sorry for your loss. I think that your doctor thinks that you have colitis or some other pathology in the colon. Colitis is basically an infection in the large intestine. The diarrhea and location of the abdominal pain go along with such an infection and I too think that to be a valid possibility. Your doctor wants to do a colonoscopy to be certain that there is no other pathology. However, you can go for a course of metronidazole 400 mg thrice daily for 5 days and see if you get some relief.