I too have SI problems and have had for some time.The problem is doctors in this country focus on the spine and not SI. I saw many DR's for lower back pain and was told everything from fusion is the treatment to rest and you will be fine. I started doing prolo about two months ago and must say it has reduced my pain at least 50-60%. Here is a good website to find prolo doc's.
www.getprolo.com
http://www.gracelifemedical.com/
http://www.prolotherapy.org/
Best regards to all,john.