(((hugs)))) It does sound like you might need to consider and accept that you will need medication "for life." IMO

Please do stay on your medications, and work with the doctors in any changes. A good therapist who is used to working with chronic pain would be beneficial too.

It's common for medications to reach a peak efficacy level, even when dealing with "natural" chemicals. Don't feel like a failure in this, it's the way meds work or don't. Keep trying, it's worth it.

Hope you get back to singing and enjoying it soon!