@bajjerfan
Well that depends on what is causing the muscular or nerve type pain. LDN works to reset the immune system.

It is used for conditions like fibromyalgia, complex regional pain syndrome (CRPS), and diabetic neuropathy. It helps with this because it reduces neuro-inflammation and modulating immune cells in the central nervous system.
https://www.fibromyalgiafund.org/giving-ldn-your-best-shot/
It usually takes 3 months on the correct dose to see a difference from LDN, and it can take weeks or months to get to the correct dose because you must start low and titer up slowly. So this is a drug that will need patience. I tried it 3 or 4 times, but I just couldn't handle the side effects, but I am notorious for side effects.