I'm not sure which other treatments you have tried, but there are azathioprine/imuran/6-MP, remicade and humira out there. If your GI does not discuss those with you, get a second opinion, and now may be the time to do it, especially since surgery has been brought up.
I had a major flare in Sept/Oct and since then my bm's have been yellow or green and stringy. I had to get off of all 5ASA's (such as sulfa, asacol and lialda). I think it means that there is inflammation in the colon still, though I have had no blood (besides my hemi) and have 1 to 2 bm's a day now, rather than 25+.
Major Flare Sept/Oct 07 ~ no blood since Dec 07 ~ almost normal bm
UC dx'd March 2000 (30 cenitmeters as of 2005-proctosigmoiditis)
Azathioprine 200mg 1xday nightly; Calcium and Vit D 500mg 3xday, Multi Vit, Folic Acid 400mg 2xday, Probiotics.
Minimal Change Disease (Kidney Disorder) dx'd Sept 2007
Prednisone 40mg 1xday, Simvastatin 20mg 1xday, Diovan 160mg 2xday. Tekturna 150mg 1xday, Fursomide 20mg 1xday. Potassium 100mg 2xday, Fosomax 70mg 1xweek. MCD may be from hypersensitivty to 5ASA drugs.