I tripped while walking. I,then, fell and landed sitting down. Immediately felt my back hurt, my head hurt after beiing shaken from the fall. This happened 5 days ago today. On the 3rd day, I felt my middle finger painful. Yesterday, the 5th day. the middle finger together with the ring finger and middle finger were in terrible pain. Then, they were turning cold and more painful. Pain radiating to my arm, at the middle. Not sure if it were a nerve or a vein/artery. What could have happened here? What can I do?