What to do with my thumb?

I went sledding, and let's just say the sled wasn't to nice to my thumb. It landed right on it. Right away I got extreme pain and it swelled up. Today there is not a lot of bruising, still a lo of swelling, and in a hell of a lot of pain just trying to move it slightly. I am able to move it, but not a lot. What should I do? I know it's not broken, but I don't want to lose movement in my thumb either. Any suggestions?