The cramps in my legs were not PN. I ended up in hospital twice and the doctors just shrugged their shoulders. I don’t know what it was or what caused it, but excruciating doesn’t begin to describe it. Magnesium did nothing. Ibuprofen helped and helped me to combat the tears but nothing made it disappear. They tried tramadol, Endone and morphine to no avail. I now take a glucosamine, chondroitin, MSM mix which is holding it back. I stopped taking them two days running by accident and the pain started back. Not sure if they are truly helping but I am not brave enough to go off them again.