Hi Thomm --
Like you, I was diagnosed with frozen shoulder (several years ago), after being told I had a rotator cuff injury among other things. When I could no longer raise my arm above waist level, I finally went to see a sports medicine doc who specializes in shoulder problems. His resident initially examined me and confirmed the rotator cuff diagnosis and said surgery would probably be needed. The doc then came in, moved my arm around, explained to the resident why it was frozen shoulder, not rotator cuff.
He said he would not even consider surgery until I underwent (and I remember these words like it was yesterday) "an appropriate and aggressive course of physical therapy". I had the therapy at the sports medicine clinic -- three times a week for several weeks, then two times a week for several more, then once a week, then once every two weeks, etc. I also did assigned simple exercises at home. The sessions were 45 minutes to an hour each. It was a tough and painful experience (sometimes bringing me to tears), but within 6 months I had (and still have) full range of motion. Never was cortisone mentioned and I probably wouldn't have consented had it been recommended -- it's something I simply don't want to put into my body. I took no pain medication of any kind throughout this time.
If you haven't already, I strongly urge you to see a orthopedist who specializes in shoulders -- a teaching hospital with a clinical practice at a university with a large athletic program is a good place to find one, believe it or not -- to be sure you now have an accurate diasnosis. If it is frozen shoulder, get hooked up with a physical therapist who is willing to give you a good workout at each session -- not just take measurements, show you some exercises and send you home with a piece of paper. This is definitely a situation where no pain will equal no gain!
Good luck. I listen to your radio show almost every day and I look forward to hearing about your progress.