Being symptom free means you are in remission, but you still have to take some sort of medication in order to maintain it. I cannot give any advice on Imuran since I've never tried it, although my GI insists I should. I have a small stricture in the TI, then when I went for a second colonoscopy, the stricture wasn't that bad, which meant it was caused mostly by inflammation. I don't want to think about
what would have happened if I wasn;t taking medication daily. Unfortunately with this disease, you can feel just fine, but inflammation is "working" inside sometimes.
Try not to let this rule your life, my opinion is stick to your meds, try to be stress free, exercise, and I'm sure since you have such a mild case of Crohns, you'll be just fine!