jweb,
Imuran (I also tried methotrexate) didn't work for me, but it might help you. Everyone reacts differently to drugs. I'm injecting Humira now, but noticing some reduced effectiveness. There are a couple of other newer mesalamines - Lialda and Apriso. I hope you find something that works. Good luck!
pb4,
Asacol was FDA approved in 1997 and has no sulfa components.
"Approved by the FDA in 1997, Asacol (Aze-a-call) is a man-made compound that is taken by mouth ..."
"Scientists were able to remove the sulfa-like portion of Azulfidine, while maintaining the full beneficial effect. The result was meslamine, an aspirin-like antiinflammatory drug, named Asacol."
http://www.gihealth.com/html/education/drugs/asacol.html
Maybe your GI had you start on Azulfidine 19 years ago, and you had a bad reaction from the sulfa component. I took that last spring and had a bad reaction, - no rash, but high fevers, chills and nausea. I switched to Asacol, which doesn't do much for my Crohn's colitis. I'm now also injecting Humira.
I also don't see cigarettes in your list of meds, but you've posted several times that you smoke a few daily to help keep your CD flares at bay. (or maybe you quit?) What would happen if you stopped smoking, and continued with everything else on your list? I guess I'm wondering how much of a benefit the smokes have on your colitis.
Jan