The med roller coaster can be quite frustrating at times. It sounds like your GI is willing to communicate with you regularly so that should help to see what meds work for you. Personally I can't tolerate Pentasa, but do well with Asacol. Good luck!
Dx'd with Crohns 1984
Polycystic kidney disease in 1996
Bowel Resection surgery 2006, Now on Asacol, Endocort, Prednisone, Imuran, Folic acid, and Enalapril.