Grab an ace bandage or a brace and rock it for awhile, even after your wrist stops hurting. The problem with heavily used joints like wrists or ankles is that it's easy to resprain them while they're healing and weakened, and then you're back to square one. I had an ankle sprain that kept acting up, eventually I just kept a soft brace on it for a week or so while it felt fine, and now it's gone for good. (The sprain, not the ankle)
That is if it isn't broken. If it is, well, just think of the cast like a super wrist guard.