I use Canasa and it is a lifesaver! I don't use it all of the time, only when I'm having specific area flares. Can you ask your doctor for samples? I know it is an expensive drug... does your insurance cover it?
As far as the prednisone... sometimes (when I'm not in a flare) if I eat something that starts my pain I can take a prednisone and it helps to relieve it, but according to my doctor, it's rare for a person to be able to use pred as a "pain pill". At the moment I'm in a drawn out flare up, so I'm on a course of prednisone; sometimes doing an 8-week or so course of them is the best way to get out of the flare.
32 year old female... diagnosed with Crohn's/Colitis at age 16, then with Proctitis in 2005... right hemi-coloctomy April 2001 (removed 12 inches)... currently taking 100mg 6MP, Canasa, acidolpholus, Protonix, B12 injections once a month, tapering dose of 40mg Prednisone, Bentil and Percoset as needed... considering Remicade