If you're able and willing to travel, I'd recommend Dr. Regan in Los Angeles. There's also a chance, if you can digitalize your films, Dr. R can view them on the internet with a phone consultation. If nothing else, it will save you the plane fare. Please contact Mark at
GPN Artificial Disc Replacement ADR for help with this. He has helped many of us and for me, I wouldn't be where I am today without him.
There's also Dr. Baumbach in Germany who is an absolute expert diagnostician, however I'd start with Dr. R.
Living with pain is a very different type of life than most people are aware of. I hope you can find the relief you so need.
Dale