Hi, I Fell Down The Stairs Over A Week Ago

Hi, I fell down the stairs over a week ago stalraining all my stomach muscles and landing very hard on my right bum cheek. It was extremely painful and is still very bruised and swollen. I have a dent on my bum cheek, presumably where i landed on the step and a hand sized area of swelling just above it which is quite hard and slightly painful. I sttuggle to sit and lie on it and it really hurts if i try and turn over in bed. I am on Cocodamol and ibuprofen for my stomach but was I just wanted to no about the swelling, how long will it take to go down? Can I speed the process up? Is there anything I can do to ease the pain?