I was walking down a hill and slipped and fell, and my back hit the side of the hill. Its been a few days and its still hurting and my headaches have came back. Is it possible to get a concussion from not hitting your head, and just violent force to the back or possible shaking. Im really worried that ive messsed myself up even more and am going to be in pain forever. Can't afford to see the doctor at the moment.