I have never had significant pain. I've always dealt with bloat and cramps but not pain like you describe. I see a lot of people here that deal with considerable amounts of pain, I seem to deal more with discomfort and frequent bathroom trips.
Diagnosed with mild proctitis in March 2007: Treated with Canasa 2x Daily
December 08: Began treating with Asacol 400mg (9/day) + Canasa 2x/day - Anemic
May 09: Off Canasa, taking Asacol (9/day)