Foot problem please help?

Ok, so I was at a party yesterday and I was tumbling. I did a roundoff back handspring and I landed on a rock. Not a rock you could pick up, but it was ha huge rock in the ground. Before I did it, I scoped the place out, but I didn't go that far. So, turns out, I landed really hard on the rock. It hurts really bad still, and there is a huge bump and is a little swollen. It hurts too much to walk, abd move my toes. I landed on the area under myfirst two toes. I don't know what I should do, is it broken, sprained, or anything???