left of my rectum. I'm not able to sit without pain. The doctor says one of the 3 muscles in my buttocks is tightening up and spasming, and perscribed a cream to reduce blood pressure. What is the cause of this condition? I never had problems with the pain before the colonoscopy. Also told me it would take up to 2 years to heal. I really can't function without being able to sit. Does excercise help or hurt the healing of this muscular problem?