HI I went to sit down in the car this morning and something happened to my back. I couldn t get up out of the car for a little while. All of a sudden, it s really sore. It hurts to move from a sitting to a standing position, I can walk but very slowly. It feels best when I lie flat on a bed or floor. I can pull both knees up to my chest, do it one knee at a time, and stretch both legs all the way up in the air (both together and one at a time). But getting up and moving around is really painful, and standing up after sitting down is awful. What should I do?