My recommendation is that you get yourself in to be evaluated by a rheumatologist. You could have a lupus-like reaction to Remicade as suggested, or one of the three types of arthritis associated with with CD. The CCFA has a brochure that describes the types.
The stiffness and difficulty getting moving are exactly what I experienced. I ultimately was diagnosed with Ankylosing Spondylitis. Please get a referral [if needed] or make an appointment with a rheumy right away.