I had frozen shoulder about 15 years ago. For months I could only sleep by wrapping my arm around a cylindrical pillow. Fixed it finally with two weeks of gradually turning up the hot water on it after a shower until the whole area was glowing red, then slowly raising and extending a couple of dozen times.
My wife got it maybe 10-11 years ago, and was bothered for a couple of weeks until we went skiing and she fell on it. Screamed in pain for a second and said she felt something rip. We skied gingerly down to the cafe and went in, after about 10 minutes: "Oh, it feels better, much looser. I can move it."
Personally, I think my cure is worth trying before you go to the "rip it free" method.
@Andy Mink Best wishes for a fast recovery (from whatever it is).