calibro saidpilates! find a pilates instructor with a good background in anatomy and they'll help you with some stretching and strength building routines.
First, I have to say thank you to calibro, you are the first person I have seen mention anything about a finding a person with a background in anatomy, esp when mentioning Pilates. I was eating lunch and almost choked with excitement.
Second, I would second that adding looking for a Stott Pilates certified instructor.
Third, I have yet to see anyone mention massage therapy. While you do not have any muscles that cross the SI joint directly, you do have lots of little ligaments that help hold your illium (pelvic bones) to your sacrum. Ligaments which connect bone to bone, take twice as long to heal since there is no blood supply. 6-8 weeks. Massage will help if there was any tearing of those ligaments, be it micro tearing or more. Once the healing starts, massage will help break up the scar tissue that will form in any direction it can and help "lay it back down" in the direction that the fibers of the ligaments are suppose to go. Surrounding muscles ie. glutes, piriformis, QL (low back), hamstrings, ilio-psoas, all could use some massage to help them relax, im sure that when the injury happened, surrounding muscles started to tighten up to help stabilize that joint. The body has an amazing way of trying to correct itself, it just dosnt always know when to stop, after a while with out massage to help let the muscles relax, an uneven torque can occur thus causing further pain. Again, find a massage therapist who has some basic knowledge of anatomy and kinesiology. Sports, clinical, rehab massage. Sounds like you have a god chiro. FierceEyes sounds like a good chiro too, we need more of you around.
Just my two cents