I've taken Asacol for about
15 years without side effects... I believe the 5-ASA drugs, which Asacol and Lialda are, are supposed to primarily work as "topical" medications - which means as they dissolve, down in the colon, it's the medicine on the walls of the colon, as it slides on through, that is supposed to help. So not a lot of it gets into our bloodstream----- and so, there aren't a lot of side effects. These are considered to be really safe meds, exactly because not a lot of it gets into our systems.
I get some "weird anxiety", as you said, almost every time I take a new thing, but it's just my head doing a trip on me. Lialda has helped a lot of people with very little negative, and I hope it's exactly the right thing to help you!!
Think positive thoughts as you pop 'em tomorrow, and let's hope they are your new friends!