I had Pelvic prolapse and total Hysterectomy 11 years ago.  I sit at my computer writing and illustrating for extended period of time.  Also have a problem if sitting on the floor scrunched for long times.  The pain is like I am carrying something heavy inside, and when I sit or walk get a sharp pressure pain up my bum, and sometimes on my lower right side.  Have had Colonoscopy in the past, was good.  My VA Dr. is going to schedule me for a CT and sonogram.  Very frustrating.  Bowels are regular and well formed, but painful to pass when having this problem, and my urine is slower, with no pain.  anyone else with a similar problem.....thanks