I recently fell down the the stairs and hurt my back quite badly. I landed on my botten quite hard, and now is left with a nasty bruise on the lower left part of my back. It feels like it s getting a little better, however it is still quite uncomfortale when I bend, sleeping on left side, driving, and putting shoes on. I feel that I have hurt something inside my stomach. It feels tender in the lower side of stomach. could I have damaged something inside?