Yes, I have. I was diagnosed at 18. I was in pain almost daily for 45 years and the last ten years included widespread severe joint and muscle pain, which was impervious to over the counter pain relief medication. I've never had a physician who would prescribe opiates, but my first lasting relief came from Duloxetine (brand name Cymbalta). This med provided a lot of relief for tender points, but not as much for my aching limbs. Then I found LDN - low dose naltrexone. Before it became known as a treatment for Long Covid, it was discovered to be an effective treatment for fibromyalgia, as well as ME/CFS. It was an absolute MIRACLE medicine for me. For the first time in my adult life, I was pain free. I was astounded by the relief. A loved one even said to me, "Hey, your back is completely smooth! All the lumps are gone!" I knew I could feel all the knotted muscles, but I had no idea they were visible.

It has no narcotic type of effects and I have no side effects from it. Life changing.

You may want to check out https://ldnresearchtrust.org/what-is-low-dose-naltrexone-ldn