I really have no advise for you. Just want to offer my support. I hope you're able to get things back under control. Have you been on Prednisone steady for that length of time? Maybe you should be looking at another opinion on treatment. Have you tried other more powerful meds?
My daughter was diagnosed Feb. 19/07, (13 yrs. old at time of diagnosis), with Crohn's of the Terminal Illium. Has used Prednisone and Pentasa. Started Imuran (02/09), had an abdominal abscess (12/08). 2cm of Stricture.