Month of pain

We had a family reunion dinner (in memory of my grandpa who just passed away a few weeks ago) and while we were playing volleyball, I hyperextended my elbow. How did I do it? I'm not sure. I just hit the ball too hard, I guess. It was two weeks ago and it still hurts to lift anything, straighten my arm, or bend it all the way. The only problem is that I'm left handed and it was my left arm. If anyone has done something like this, what can I do (not put it in a sling, because I have to use it. I'm a mom....silly)?