Personally if I had to choose between Remicade with Imuran/6MP or surgery then I would choose surgery. But there are other options. Even increasing your dose of pred sounds good compared to that.
Please check out the many alternative options that have helped many of us. For example you have nothing to lose by trying rectal meds, or going gluten-free for a couple of weeks. If you find LDN effective (and many here on this forum do) then it is relatively safe with few side effects:
www.healingwell.com/community/default.aspx?f=38&m=2338980