interesting, because I have POTS with the same pain. I was told I have SI joint inflammation, but I've had it intermittently for 2-3 years seeing numerous doctors for it. so far my MRI shows up great, but the pain is still there. I'm seeing a rheomatologist tomorrow who thinks it could be spondylolisthesis, but I will find out for sure tomorrow. It is mind boggling with all of these problems and I was wondering if they were connected with a possible stenosis putting more pressure on my lower spine causing POTS symptoms, but I think that is more related to cervical (neck) stenosis. Any ideas on this would be greatly appreciated stacy