You probably built up a resistance to it. I used medical marijuana for pain when the neurologists wanted to prescribe opioids. It was a while ago and in doing my due diligence I spoke with a number of doctors in CA where it had been legal for a while.
The pain was so bad I could not sleep. I was 35 with uncontrollable blood pressure and cholesterol. Was told by Northwestern University Hospital I would be lucky to live until I was 45. The dope took care of the pain, got full night's rest, no longer needed blood pressure or cholesterol medicine.
The doctors didn't connect the dots and completely blew the diagnoses. (This is not my only negative experience with doctors as they have been taught for years now diagnosing "most probable outcome" so the people outside the center of the bell-shaped curve receive poor medical instruction. The big exception for me was my cardiologist and heart surgeon. They were spectacular.)

Medical marijuana works with muscle pain, it does not help nerve pain - I know this from experience as well.

In time vaping marijuana no longer provided relief for me. What I did find out was creating medical marijuana in a coconut-based form adding DMSO and then cream that I applied to my muscles from waste down.

It helped for a while but I had to replace it with CBD, which I am still using. This does not help the nerve pain that runs the length of my muscles fibers.