I fell down some stairs on Saturday morning and badly bruised my bum. It has been painful to walk, I can't put any pressure on it and it now feels like there is a large solid lump. It is still painful but it now also feels like my muscle is tight. I have also had no appetite since Saturday and have only picked at some cereal since then. On the day that it happened I went to bed at 5pm as I was freezing cold despite the fact it was warm outside, and slept for 13 hour. Is this all normal?