Definitely hang in there. I was in the same boat but maybe not as bad. I had UC that spread and got worse while being on Prednisone and Asacol. I eventually switched doctors and was put on Imuran (immunomodulator) that really has helped me heal my colon and put my UC in remission. I don't know what your doctor will recommend but please do not despair. This is a rather common occurance where people with UC find that the 5 ASA meds don't manage their UC well. There are other options and your doctor was right to stop and re-evaluate because what your presently doing isn't cutting it. Good luck and keep us posted.
MyUC