I've been having that problem with my legs since January, (but mostly on my right leg from knee down) then it started on my scalp, sometimes one side, maybe the other, then sometimes the whole head!!) When I went for my BP checkup 4 days ago I told the doctor about it! He said that that just happens, no reason. I asked if it could be a pinched nerve he said no, then I asked the scary question, "How about a brain tumor?" He waved his hand at me and said, "No, nothing like that!" He told me my nerve endings are just misfiring, common and not a problem at all. I then told him about a WEIRD feeling I get if I scratch my stomach or upper leg, a WEIRD feeling that runs down both legs. He smiled and said, "Don't scratch" (LOL!)
It IS awful and if my legs have "chills" it gets worse when I move them.
I told him all these problems happened from this winter when I was constantly shoveling snow - he said, "I think you stressed yourself out!"