I'm having such a bad time with lower back pain and in SI joint (buttocks). One therapist says it also has to do with my fibro because I can move the joint - it's mostly muscular and tendon pain. I have heard other people say it's hard to walk and stand with fibro. This is what I'm experiencing now (didn't have this years ago). My rheummy is testing also for autoimmune disorders. Oh, I thought it was only fibro and myofascial trigger point pain. I sure hope it's nothing else. Most of my lumbar x-rays only show minimal arthritis. I don't really do pain pills (they make me feel wierd) so just Tylenol and heat. Any other suggestions. Some say to take SAME-e and/or Ginger for pain. Any suggestions will help. I seem to have had mild fibro and now it's worse. Thanks!