What is wrong with my shoulder?

The injury happened at a dance, I am 20 years of age and was break dancing. It was "master swipes" that injured my shoulder. It's very complicated to explain so if you want to see what it looks like to get an idea of what i was doing when i hurt myself here is a clip, skip to 50 seconds: http://www.youtube.com/watch?v=RmuhtC-TCck. I did it once and it made me a little sore but I thought nothing of it because i get sore from bboying very frequently. Then i continued to dance and it began to actually hurt and bother me. Like an idiot, I did master swipes one more time and put my shoulder in searing pain which lasted the rest of the night and hurt just as bad when I woke up this morning. I have ice on it right now, for better or worse. Just walking around swinging my arms normally hurts very very slightly now and then. I can rotate my arm in a small circle (while it is at my side) without pain. What really hurts is lifting it, especially behind me. It also hurts to type; lifting my hand while keeping my elbow at my side hurts my shoulder depending on how far up I elevate my elbow. I don't know what is wrong with it so I don't know how to treat it but I'm taking anti-flammatory pills and icing my shoulder in hopes that it will help. I have nothing against giving more info through email if anyone feels so inclined. I'm hoping it's not too serious but I need it to heal as quickly as possible. Thank you very much in advance. My email is as follows: antoniomeredith@rocketmail.com