I have been having a burning pain my calves and pain in my knees. I hear a grinding sound in the right knee during extension. It is hard to sit still for any length of time and I have a hard time sleeping because I feel I have to keep my legs moving so I don’t feel the pain. I feel a constant dull pain. The pain also extends to my upper thigh on the left to my lower back.The pain in my lower back is only on the left.