I just woke up today with tailbone pain, too. Totally out of the blue, with no discernible reason for it. It really hurts with standing up or sitting down.
I've had low back pain and mid-buttock pain before, but never tailbone pain. Very odd.
Ulcerative proctitis, diagnosed about 1998
Rowasa nightly, Canasa suppository in morning
Taken off Asacol under suspicion it caused low white-cell count
Fish oil, magnesium, multivitamin, Align probiotics
Allergies to dust, molds, penicillin, some trees and grasses, and cats (but I still have three!)
Pescetarian (eat fish but no other meat)