I had this before my op, and in both legs. I was told it was nerve pain but could not have Gabapentin as I am Epileptic, and it would overload my drug regime. I just had to put up with it. It isn't at all pleasant, and used to make me sweat a lot in bed. I seemed to have my own heating system in bed with me. I had some treatment with an Osteopath, and it did resolve. I think it may have done anyway, but I think I would try him again if it happened again, as I lost so much sleep.