How old are you? I'm assuming you have at least one colonoscopy to diagnoses your UC. Has it been a while since you were last scoped? Do you have a GI doc? If yes, what is the doc suggesting?
I can't response to your question regarding asacol as I do not have UC, but I understand it can be painful. If you are in currently in a flare, that could be causing your pain.
rectal cancer - April 2004
46 yrs old at diagnoses
stage III C - 6/13 lymph positive
radiation - 6 weeks
surgery - August 2004/hernia repair 2014
chemo - FOLFOX
NED - 10 years and counting!