joint pain is tough with this condition. it could be pred/withdrawal, it could be the chrons, it could be another autoimmune issue or something not related to it like a virus, lymes, etc. going to an rheumy is a good idea.
do you have any other symptoms like fever, etc?
for my joint pain while i am sick(and have been over the past 5 weeks without cause, waiting for blood work, similar situation to you), my primary has prescribed me ultram ER 200 mg once a day which knocks the pain down from where i can barely move to at least I can function now. it doesn't fix it as well as the left over percosets i have do, but the ER lasts longer and its not as strong a narcotic and leaves me with less of a hangover. any OTC never touched my pain. I would just sit in the bathtub for hours.
History: UC/Chrons since age 22, now 27. Several huge flares since then. Entire colon diseased at some point from cecum to rectum. Also had previous inflammation in terminal ileum.
Currently: flare -9/19/08 - now|Panic Disorder - 6/25/08 - now|Lyme Disease - 12/09/08 - now|Dysplastic Nevus Syndrome - 6 recent mod dysplasia moles excised, and many more to shave biopsy.
Drugs: prednisone 30 mg|6mp 75 mg|lialda 4.8 mg|Paxil 50 mg|Klonopin .25 mg|Trazodone 50 mg|PRN Perc/Tramadol