Potential shoulder injury advice...

So, I was out playing Ultimate Frisbee this evening. I felt it pop when I threw a long backhand. It now hurts to lift my arm to the front. I am icing it 20 on and 20 off and took some Aleve. I guess I'll just have to wait until tomorrow to see how it feels, but I'm pretty sure it's injured. I have been training for Zones for 6 months now and I am not sure of how to feel. I'm angry with myself for going out to play Ultimate, I'm scared that I'm not going to be able to swim at Zones. Argggggh!:bitching::bitching::bitching::bitching::bitching::bitching::bitching::bitching::bitching: I will try to get an appointment with a shoulder guy on short notice. I'm hoping that some of you have some advice. I read the shoulder poll, so I know there are some of you with firsthand knowledge.