Hi Caithanc,
Sorry to hear your current meds aren't working. It's frustrating I know! Imuran didn't work for me either so the next thing I tried was Remicade. It worked really well for me for a good few months but then unfortunately in my case the effect started to wear off.
I've been prescribed Prednisone on and off for about 5 years now. It does help when I'm having a bad flare to get it under control, but it is a temporary and short-term solution and my GI has always given me other meds to maintain the remission. Everyone reacts differently but it can have some pretty unpleasant side effects - the first time I took it I was euphoric and had never felt so good, but since then I've had some bad reactions (mood swings, sweating, tremors ecc.)
Remicade certainly isn't a last resort. As Cantthinkstr8t said, there are other biologicals out there. I've tried both Remicade and Humira and am now waiting for Vedolizumab to become available where I live.
Best of luck and hopefully you'll find the right medication which works for you!