I don't know what the fuck I did to my arm, but I never want it to happen again. I cannot lift it or stretch it or do anything that causes movement in the shoulder joint without piercing pain radiating through my arm. Possibly I have pinched a nerve in my sleep, which is ridiculous. At least it's not my dominant arm, so I can still mostly do stuff. I just want this pain to go away. I keep moving without realizing I'm doing it.