Honestly, the absolute best medicine for my (going on close to 20 year) chronic back and neck pain is a topical salve. You could use a mix of thc and cbd as inputs, really you could do it with any cannaninoid that is able to be absorbed through the skin. hash makes a great salve
You infuse coconut oil, then add in Arnica oil as well as any essential oils that are anti-inflammatory/ you think smell nice. I use at least ginger amd tumeric oils.
Melt beeswax, add coconut oil from above with shea butter and coco butter.
I find that when I apply it head to toe it instantly silences the nerve signals yelling "pain!" to my brain. Absolute magic