Throbbing Shoulder Pain At Night My Shoulders In Alot Of Pain?

My shoulders in alot of pain? - throbbing shoulder pain at night

My shoulder injury started randomly last night was a very bad pain ... just above the right shoulder and right behind the bone ... left the house today, but again this evening .. My arm feels heavy and throbbing pain and it hurts worse when I move ... idk I'm only 17 ... I have ... I am a cashier, so, if she can not leave a real problem