I posted at #96 about that same thing-article from a doctor. Interesting, you had 2? Damn!
The doctor wanted me to go in for surgery, but we had just cleared years of medical debt and I was unwilling to spend any more if I could avoid it.
I have a tendency to sleep on my side, with my arm up or curled around my pillow. When one arm started to really hurt, I overused the other arm and hurt that, as well. What a mess!
Going with the best pillow on the market, changing my sleep patterns, and resting my shoulders as much as possible made a huge difference.