This stuff seems to ebb and flow on the AIs. You think you are doing OK, then it all turns to crap.
I've been trying a PEA supplement (which my onc was not adverse to) in an effort to find a way to deal with what has now become a chronic pain event. Without stuffing my head with pain killers. My local, and rather progressive, chemist recommended it.
I'm a bit ambivalent about it's effectiveness, but I know others who say its made a huge difference. It's impossible for me to know what is cause or effect--I'm three years out of active treatment and my world is very different from what is was in 2016/17. I'm more active and working again, but still plagued by joint and muscle pain but I have certainly upped my activity levels since I started taking it in November last year.
It's worth a look, though as it's classified as a food supplement it is not cheap.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500919/