Sorry to hear you are in so much pain
I had really bad lower back pain for years after I fell down some stairs. I eventually found this really great muscular-skeletal physio who worked out the problem. Basically when I fell the back muscles that copped the injury locked up and stopped working so the rest of my back muscles were doing extra work and so pulled my hips out of alignment and pulled on my lower spine. The physio fixed me up and got me started on Pilates to strengthen my core. That was 3 years ago and I haven't looked back since. No back pain since.