When my gastroenterologist suspected UC, he first did a full stool panel to check for infection, parasites, etc. That came back with elevated white blood cells (I think?) which then led to the colonoscopy. I was awake during it (was pregnant at the time and declined anesthetic) so I was watching the whole thing, and even I could see the inflammation, etc. that told him it was UC, almost certainly. He still did the samples but he was 99.9% sure.
I hope, for your sake, that you don't have UC and simply another condition that may heal up for you. Good luck!
Diagnosed June 2006 with UC, mild to moderate symptoms
Flared August 2006 after childbirth - stopped flare with Entocort
Currently in remission!!!
Asacol 1600 mg daily
Canasa suppositories PRN (haven't needed since early '07)
Triamterene w/ HCTZ 75/50 for mild HBP