I didn't realize your shoulders have been frozen for years, how terrible.
No therapy has helped much for you?
Drs haven't suggested manipulation under anesthesia?

I hated having to drive to PT when I was still working, it just added to the sx. After I was off work then I was closer to the PT places.

Did they ever try low level laser on the shoulders for you?
Or the LED lights like Broken wings uses?
Or even the far infrared heating pad or lights?

Although none of the PT places I went to had them - it was the chiropractor, but maybe some other healing places might have them too.
the LED pads/lights you can get without a drs rx.
far infra red heating pads are no rx needed as well as the lights, but they do cost a bit.

Shelley had frozen shoulder about a 1.5?yrs ago, you might do a search for what she found to help hers. Or just send her a PM, might be simpler..