I Was At A Waterpark. I Flipped Over In My

I was at a waterpark. I flipped over in my tube, and my upper back hit a rock, used to make rapids in the lazy river. I hit the rock directly, and the pain was sharp and severe. I got up and out of the lazy river okay. I moved my arms around to see if I was okay, and it didn't hurt then. However, as time went by, the pain in my shoulder blades and upper back became excruciating. An on-site nurse told me she saw red and purple, but I currently can't access a hospital until tomorrow. Now, it hurts to extend, lift, pull, or push with my arms, and walking is painful, too. What's wrong with my back?