I had friend in Colorado who suffered from shoulder pain, and basically made his living as a handyman. He bred a strain for CBD content, not THC, and claimed it helped without messing with his head.
I can't say for certain how much placebo effect was involved, and never tried any, but he claimed that helped. That pain may not have been nerve pain, per se, just older joints and cramped muscles, so the effect may not be the same for those suffering from something like fibromyalgia.