Have you tried massaging legs with magnesium oil and taking CBD orally? When I was going through the diagnostic process, my doctor and I were talking about differential diagnoses and mimics. I mentioned cramp fasciculation syndrome and he said he prescribes 5 mg. of Valium 4x a day for CFS. He is a neuromuscular specialist. I told him my pain management had me on Valium and he said, "stay on it." Even after I was diagnosed he said stay on it and add Gabapentin.
Tillie, regarding your neck posture post, I suffered through PT, bought a $1,500 home office chair, bought an adjustable bed and tried every pillow, gadget posture improving device I could find. The only thing that helped 20 years ago and still helps today is Valium. As I said, it was a game changer. I never could have kept working at the pace I did if it were not for that little pill. spending too much time on the computer still gives me neck pain but now I can take multiple breaks and there is no deadline on my current publication.