Hi Abol,
How long were you on pred for?
I agree that going off the pred would make your pain worse, but surely the nurse could have told you how to taper, if at all.
I would think that maybe they should have kept you on the pred till the MTX kicked in, which can take as long as 3 months or more.
I hope the MTX kicks in for you soon and you wont need the morphine anymore.
Take care
Jo