Hello. I'm fairly new here, and was diagnosed in the same year that you were. No solid stools for 11 years, and only one case of piles which went away with diligent application of Anusol <_<.
But seriously, the first question which sprang to mind was why wouldn't you try Remicade again? What are you hoping that the doctors will offer you that they haven't been offering you before? (Apart from an attitude adjustment.) Another type of drug? Surgery? If it's a money thing, then do excuse me. I feel for those who have to battle with their insurance, or lack of it, as well as their disease.
As for disability, I'm even more useless with giving advice there than on other stuff. But if you go to page 2 of this forum, there is a thread there about CD and state disability which will hopefully provide some useful advice on how to claim. The only general tip I can give is that if you suffer from depression include it. Get a doctor's note for it. In the UK at least, it would appear that mental disorders have a far stronger weighting than Crohn's.
In the meantime, maybe somebody with fistulas (I don't get them) can help you more. Good luck!
PS: I wouldn't worry too much about your immune system. Unless you're on a very high dose of azathioprine, it's probably okay. It's not like HIV, which wipes out your immune system and leaves you with nothing left whatsoever to fight opportunistic infections. You still have a functioning, if somewhat modulated, immune system. And indeed, those on immunesuppressants don't appear to catch colds or pick up minor infections any more often than the average person.