I experienced this when I was around 40ish (and I'm early 50s now!). I only had a couple of months of PT -- very painful! No surgery. I did struggle with sleep -- pretty painful just to lay down in bed, so I used prescribed meds for sleeping during the initial, most painful months.
I did continue PT on my own -- primarily using a pulley contraption that hangs over the door, I sat in a chair with my back to the door, then I used dangling handles to do alternate pull-downs with each arm. (Search for something like "overdoor shoulder pulley" and you should see plenty of options.) Just holding the handle and pulling down pulls-up the adhered shoulder, so it's pretty effective. After a year or so, the pain went away and within 3 years I regained (and still have) near 100% of my original range of motion.
