Bad shoulder pain and swelling.?

yesterday i had wrestling and during the match i wrestled up (me 130 other guys 135) he was a lot bigger than me and i was losing and needed a desperation move so i tried a roll. when i rolled my arm got caught and and over stretched me shoulder. Today i have a lot of pain and stiffness i can move my arm but only slowly. the top of my shoulder (clavicle bone) is where the pain is coming from. my mom is friends with a chiropractor so i am going to see him tomorrow before a doctor. just wonder if anyone could let me know if this is a tear in my rotator cuff because i do not want this injury to affect my lacrosse season which is less than a month away. if anyone know what the injury may be please give me all the details. Thanks guys!