i had the same thing, nothing helped, i couldnt press any weight over head, did the exercises, they wanted to do the impingement surgery but grinding bone off my shoulder joint just dosent seem good. I had been off stuff for a few years prior and got some deca and some test and no joke it went away. I guess the deca may have done something. Im not a Dr nor advising that Deca is the cure all for impingement syndrome but it cured mine. 5 yrs later and my shoulders are my best BP.
But i didnt have a tear, so make sure yours is not torn, get MRI and go from there. Hope you feel better, i know i was in alot of pain.