What's wrong with my arm?

3 days ago I had a playoff game in softball and I slid into home and some how my arm go caught on like the catchers leg as she was stepping back and my arm twisted, was forcedbback, and I heard a crack. Right after my coach got ice for it and had someone from my team's dad come look at who was a doctor and he told me I needed to have it x-rayed. I've been putting it off because we have states this week and I NEED to play and I don't want to have to miss the game. Ever since the night I hurt it, it has swelled up and bruised right below my elbow, and it hurts to straighten my arm or move it at all. I've been Advil as much as possible but it still throbs when any weight is put on it or if it is touched or moved. Do you think its just a sprain that I can suck up and play in my game or should I get it checked out? What do you think is wrong with it and whats the treatment? Thanks. Btw its my left arm if that makes a difference.