HELLO, I have a lot of medical problems. But one is very baffling to me. Every so often i get a drawing feeling in my muscles. Then they begin to jerk.I mean an arm may fly up and hit me in the head. Then the muscles in my legs will just tighten up and jerk over and over, It HURTS. and moves around to different parts of my body, It will twist my body, which is bad when you have scoliosis, bad. Last night it went on until 6 am. I feel like i've been run over by a truck. What causes this? Help!