Disbooner,
I couldn't take Asacol either for the same reasons, it worsened my symptoms. The only 5ASA drugs I have been able to take and see results from are Lialda and Canasa suppositories. The doctor prescribed 3 Lialda a day. Three gave me gas and with the gas came mucous. So, I cut back to 2 a day and that worked MUCH better.
As far as the Pred, I am weaning off for reasons other than remission. My doctor explained to me that the Pred was to get things under control and then, hopefully, a 5ASA drug would start working.
I totally agree with Belski, I think your doc should be able to add something else. I also totally agree with Belski on doctors being clueless sometimes.
Good Luck!
Beth