I have been getting lower abdominal pain that occurs mainly on the left side and middle. It comes every so often, off and on. The pain is excruciating and it won t go away until I go to the restroom. Usually I have diarrhea , with the occasional accompaniment of blood . Sometimes the pain hurts so bad that it leaves me feeling light-headed and physically weak. I have taken an ultrasound test, a stool test, and a colonoscopy. It has been concluded that I have a hemorrhoid which explains the blood in the stool, but the pain still comes and there has been no results of what is causing the pain.