Hello Roberto,
You really seem to have tried everything! I think it sounds like you may well be a good candidate for two-level ADR. I hope you will find a good surgeon and get better! Based on my research, ActivL sounds like a good choice. There are also other promising discs like Freedom, which you may consider. M6 is a bit controversial, but most likely better than fusion still. With your history, I don't think conservative treatment will help enough.
Wish you luck with decision making and keep us updated!
