I hurt my back falling down the stairs?

About three days ago i was walking down the stairs and slipped and landed on my back. I skidded down a few steps in the process :/. But it immediately knocked the wind out of me. I could breathe, and was gasping for breath. When that finally stopped i had trouble sitting upright and had horrible pain in my upper back. the same pain is still there today, but the sitting problem is over. It only hurts when i jump around, or up and down, and when i stretch my arms out in front of me. The pain is in my upper back right along my spine. I hope i didnt break/fracture a bone there...my mom said i could have just hurt the muscle. No pain when you touch the spot though, and no visual damage around that area...any help?