i dont know what exactly your injury is or how you got it. last year I crashed in a race that was a flip and an ass first (actually tailbone area) landing on the road while going somewhere around 30 mph. at first i thought i broke my back, then i thought i broke my tailbone, then i realized i could move, etc., etc.

anyway, i had pain radiating from the tailbone in the direction of my hips on both sides. the PT I go to explained that when there is an impact, as there was in my case, surrounding muscle tissue responds immediately by tensing up in an effort to protect itself, which combined with the bruising from impact was the cause of the pain i was encountering. treatment was initially ice, some massage, and stretching, then when bruising was diminished (like a week) we treated with dry needling (http://www.schrierpt.com/dryneedling/). i was off the bike for a couple of weeks, but that was due to a concussion from the same crash and requisite recovery time.