I feel the discouragement with both of you. Last week I was where you are.
I think it's good advice from fruitgirl. I haven't gotten to Imuran yet, but can the doctor increase the dosage?
Most of all, I'm wondering if you're putting so much stress on yourself that you're going into a flare, which in turn is pushing you toward a flare, and before you know it you're in the vicious cycle. Are there any other things you can do for yourself to relax? Massage? Deep breathing? Something you really love doing? I know, easy for me to write, but not so easy to pull off.
Katie, you're in grad school because you earned it, you've put the work in to get there, and you deserve to finish. I believe you will.