I fell down the stairs 10 days ago. At first I had a sore shoulder but that passed after 5 days. It was a few days after the original fall that I noticed my lower back was in pain. It's not sore to the touch but my lower right side of my back is excruciating when I move or bend. At first it was just a stabbing pain which I felt was impact damage to the muscle or even bone. However now after 10 days it has not eased off, instead the pain is a sort of burning feeling as well as the stabbing pain.