For me, one of the worst symptoms of Crohn's Disease in pain. I get joint pain, all over body pain, and stabbing abdominal pain. While I am busy during the day I usually forget about the pain, but at night when I am wining down and getting ready to sleep it seems to magnify.
I read a very helpful article on Health.com about keeping a pain diary. I haven't done this officially and think it could be worthwhile to see if any particular activities or foods effect my Crohn's Disease pain.
They even gave out a link to a pain notebook you can print and fill in as well as a list of what subjects to record in your pain diary.