Gosh, you've had a tough time.
First up, start doing our basic lower back exercises, just three of them, very gently EVERY morning before getting out of bed, and several times a day; they only take 40s.
Maignes is a possibility for two reasons. Firstly you have groin pain, but that could be caused by other things too; like a hip injury when you fell.
The second is that Maignes is a high lumbar facet syndrome; that's where the spinal cord ends and an injury there can cause a so-called cauda equina syndrome: loss of bladder and and bowel function. But the neurosurgeon would have been looking for that.
Only a careful examination would reveal if some of your pain is coming from the high lumbars.
Perhaps a visit to the chiropractor who helped you in the beginning. Take your scans...
Meantime, get going with those exercises, limit bending and sitting in "comfy" chairs. Avoid the vacuum cleaner.
Good luck Sandra, no easy answers.
Dr. Barrie Lewis