Get to the doctor!
I sprained my ankle badly in March 2006 (I stepped off a curb and fell down... riiiidiculous!) and it took me a week of crutches, then 6 weeks of physio and a lot of babying it before I was even walking without pain. I wasn't cleared for running or other high-impact activity for over 4 months, if I remember right.
You really want to let it heal fully - you'll think you're okay, and try to do something more than you are cleared for, and the pain will come RIGHT back.