Manhattan, I think you need to make a decison. Either you're going to go with your GIs advice or you're going to go your own route. I think Remicade would be your quickest potential method of getting into remission. It would potentially get you back on your feet very quickly. Another thing worth trying that your GI probably won't offer is something like fecal transplant or LDN.
Has your GI ever mentioned antibiotics? I tried some when I was in your boat a year or so ago. I wasn't responding to pred quickly and I had already been up and down on it for months, I don't know if it helped but I felt better knowing I gave it my everything before giving into immunosupression. I went for 6mp over Remicade because I was willing to wait to get things under control. 6mp took forever to help me and it was very difficult because I wasn't feeling good but now I am doing great. I like 6mp becasue it is a pill but it can take months to help and if you're sick, that's a long time.
I was on 6mp for a year and I was still having a lot of issues with symptoms. Finally I started an antidepressant for migraines and around the same time, things stabilized. If you're stressed, I recommend you try speaking to someone and getting treatment. I have to wonder if my stress level has been reduced from the antidpepressant and that helped my UC.
What did he mean make the year long committment? Why is 6mp/Remicade a year long committment? Both treatments are long-term and shouldn't be discontinued if they are working for you.
I agree with bananagirl, after you're on pred for a while, you will welcome anything over the side effects of the prednisone. Try not to let it get to that point.