I remember getting cross checked on my shin in hockey, and we weren't wearing pads either. I got a nasty bruise out if and it felt numb too. I did what you're doing now and eventually it went away. Sprains are different story.

I doubt that it's anything serious in your case, but you should still have it checked out tomorrow. If it's not swollen you might want to put a heating pad around it, there are also creams/gels that help the blood circulate where you put it on. Arnica can also help the bruise disappear faster and help with healing.