Exercise (carefully monitored by health care professionals) will work for most people.

It doesn't work for all people.

I get the impression that katastic has made genuine effort to engage in a wide range of treatment, and is still not getting much if any pain relief.

People find it weird that we still don't have good treatment options for some types of pain, but that's the reality. Some people just have to live their lives in near constant pain.

Here's the Faculty of Pain Management with some information about pain: https://www.rcoa.ac.uk/faculty-of-pain-medicine/opioids-awar...

And about the challenges of treating long term pain: https://www.rcoa.ac.uk/faculty-of-pain-medicine/opioids-awar...