Sorry for the delayed response; it took a while to find my old records. My muscle pain (in legs; mostly thighs) started suddenly about 1 1/2 years into my SFN journey. I also had elevated CK (indicative of muscle damage), and EMG showed chronic nerve damage. I started on plaquenil 3 months after that, and I took it for 3 1/2 years. Never noticed any difference on or off. My symptoms are really variable though.

One thing that may have helped me is R lipoic acid, which my neurologist recommended last year. I'd never tried it because it sounded from this forum like it was mostly useful for diabetic issues, which I don't have, and burning pain, which is minimal for me. After a month my severe muscle pains went down from an average of 15 incidents per month, to 6 per month, and after a few more months, to just 2-3 per month. I had never gone through even one month of such drastically reduced muscle pain in the 4 years since it started. I was about to post my experience here when my hair suddenly started falling out and I stopped the RLA. Although I knew from the forum that it can interfere with biotin in the body and I'd been correctly using supplemental biotin all along. In summary, I took RLA for 6 months and have now been off it 2 months. The muscle pains haven't returned yet, so I can't be sure at this point whether it was responsible for the drastic pain reduction, but it would be some heck of a coincidence otherwise.