Hi Fran and welcome.
You've had a long history of back pain/problems and have been through several surgeries. Unfortunately, fusing discs actually promotes further degeneration as you've already experienced. You've already tried the lesser invasive remedies and it might be time again for more surgery but which one?
You might try calling Mark
GPN Artificial Disc Replacement ADR. He's a spine patient advocate and can facilitate consultations with the best doctors all over the world.
However, another consideration is insurance. Depending on your circumstances (and fight), they might have the final word.
Good luck to you, Dale