I'm having really bad shoulder pain. What's wrong with me?

Two days ago I woke up with some shoulder pain. It hurt to pick up my backpack and such. Well today I woke up and its 100 times worse I can't lift my arm without it hurting really bad and I've judt been holding my arm to my side. Just using my hurt arm to put deoderant on hurt really ******* bad. And it... show more Two days ago I woke up with some shoulder pain. It hurt to pick up my backpack and such. Well today I woke up and its 100 times worse I can't lift my arm without it hurting really bad and I've judt been holding my arm to my side. Just using my hurt arm to put deoderant on hurt really ******* bad. And it hurt so much I almost cried.

Its the top of my shoulder that hurts. I've broken the same arm twice(left arm).
Can anyone tell me whats wrong with it and what I should do.
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