Help! Back injury and I don't know what to do?

Yesterday I was practicing for a talent show, and me and my friend do a flip together, but she took me too low and i hit my head, so we told her not to go so low and how to to in better, so we tried again, this time I hit my head hard (btw we were practicing on concrete, it was the only place big enough) and my neck through my upper back snapped crackled and popped a bunch, at first i was really dizzy, but I didn't tell anyone because I didn't want them worrying, and my friend was crying already. So now my back kills with every sniffle, cough, or movement I make.