Six weeks doesn't sound so bad. If you could start Imuran at the same time, however, I think that'd be more useful. I would probably be
open to taking it if that were the case, since things have gone so far as you having an accident. I say I would want to start Imuran at the same time because it takes a long time to start working. That way the pred could start calming things down, and by the time you tapered off it, maybe the Imuran could take over.
Maybe you could call them and ask about that option?
If you don't like that, there are alternative treatments out there, too. Supplements, diet, fecal transplant. All kinds of stuff.
Also you may want to ask about rectal meds like Rowasa.