Dean -
I posted some things that may (or may not) be helpful in the topic "Wake up with a "cold " every morning using CPAP".

BTW - I understand the disrupted sleep due to injury and pain. I had shoulder surgery of my left to fix a torn labrum and remove arthritic spurs around the AC joint where the shoulder attaches to the collarbone. When the left is fully recovered, I get to do the same thing on the right shoulder.

All the best to you.