Tooth become sensitive after hitting it?

As I was football and moving my chain bounced up from my neck and smashed into my front left tooth and the one to the left of it. I dont think anything broke but it hurt for sure. Since then every time I've drank cold water my tooth feels sensitive, or when i consume something of opposing temperatures. For example i can drink some luke warm water after eating a hot pot noodle and my tooth will ache a little. It's not unbearable pain but is as you'd imagine a sensitive tooth feels. What should I do? What could it be?