Gosh you have been persistent and thorough. Well done, and it must be very distressing that you haven't responded to ANY treatment.
These are the kinds of thoughts that go would be going through my mind.
1. Firstly that this is unlikely to be anything serious in the sense of cancer and the like, but it is serious because it's seriously disrupting your life.
2. Secondly, is this a referred pain? The spine is notorious for what we call "incidental findings". That L5/S1 facet arthritis may be COMPLETELY irrelevant. It's there but not the cause of your pain.
One particular area to look at is the Thoraco-Lumbar junction. It is well known for referring pain to the buttock and sometimes groin. Read more at Maignes syndrome ...
3. Next, do you perhaps have a short leg? Sometimes a simple insert in the shoe can make a vast difference. The difficulty being how thick, and whether it should be under your heel, or the whole sole, or a shaped (and expensive) orthotic.
I do have different exercises, but if those haven't helped an iota, others probably won't either.
4. Often knowing exactly what provokes the pain, and what relieves it, a)helps you to understand what to do, and what not to do, and b)may give the clinician a different slant on your problem.
5. Could this be an inflammatory process? Look to your diet, and in particular the ratio of omega-6 / omega-3 in your diet. If it's high then one has general inflammation: muscles, joints, blood vessels, bowel.
I really commend you for being persistent. Don't give up. Press on...] Go from Zero response to any treatment for LBP to Chiropractic Tips …
I hope this has contributed.
Dr Barrie Lewis