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.
I hope you find your answer soon because that is no way to live. I went though that when I tried to get off of remicade. I thought that I had the flu. They also thought that I had lupus. The test came back positive but the dr said that it was a false positive from all the meds I was on. So please make sure that you go to someone who is going to make sure everything is checked. I got back on remicade and everything is great . Good Luck