When I got my UC it came with reactive arthritis (apparently some people get both together). I have very deep bone pain in long bone in my leg, but additionally terrible pain in my neck, all the way down my back, and into almost every joint. The pain in the joints of my feet and toes makes walking pretty difficult, but I force myself to take a daily walk anyway because I know it's good for me.
I have yet to find anything to help with the pain. While on the prednisone, it did lessen some (but didn't help the UC bleeding).
I use a heating pad in bed as much as I can.