I have a frozen shoulder, it is a real sod too
You do get plenty of movement with a frozen shoulder, the problem is the restriction of movement, and if your arm extends past whatever happens to be your limit it is bloody agony!
It is a pain that grows to a very high peak and then fades away after a few minutes.
Typically if you lift up both arms as high as you can, you will find the bad arm will not extend as high as the good one.
I've had a couple of cortisone injections and it has helped, but it hasn't gone away.
I've simply adapted how I work and just put up with the pain, oh, of course I do swallow a couple of ipruprofen every day in the hope that helps...I think it does!
That isn't to say you have the same thing, the shoulder is one complicated joint....
Go see whichever doc in your practice is either the chiropractor or osteopath and they will at least give you an accurate diagnosis.
Ian