Hi Rookster. Glad you found the forum and got into the program you want. Congrats!
Here's an article about
what research has shown are the most effective medical treatments for UC:
http://s3-patients.gi.org/files/2011/10/AJG-IBD-supplement-0411.pdf. I hope it is helpful for you. I can't advise on Imuran but I hope it helps get you back into remission! Nothing like a little stress to completely wreck your plan.