Make sure you ice it. If it is bad enough that you can't bend it a sling to immobilize it to prevent further damage may help. I would go to the DR (of course I did not when the same happened to me). If the DR does not find anything more than a sprain, he will probably give you anti-inflamatory pills.
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For what it is worth, here is what I did to get better and I never stopped practicing which wasn't the smartest thing to do, I just did not want to miss any training.
It might just be sprained or slightly overextended. When I injured my elbow (popped), I purchased an elbow brace and took anti-inflammatory pills the first week. I then purchased elastic bands to regain flexibility and to rehab the arm. The elbow brace prevented me from overextending the arm and te elastic bands helped me strenghten it to the point where I was able to lift weights to strengthen the arm altogether. This was my experience. Regardless, a visit to the Doc is in order as you do not want to mess around with injuries.
