As much as I would like to enroll you and others here into a more elegant and successfull method and perspective , on shoulder and other MSK issues , I have been doing this very thing on Re for some years and feel somewhat reluctant and time pressured at the moment to go over this territory from the beginning. It is possible , with careful orientation to the RE site , to find previous posts under headings. I suggest you begin with key words , such as Continuous Mobilisation ( CM ) , Wikipedia reference-linkfrozen shoulder, Ginger etc .
I have also posted many times with similar p.o.v. on somasimple.
I am happy to contribute to your considerations on shoulder pain here , though cannot commit to a exhaustive and detailed response. Should you be willing to follow my guidance and sugestions, I am certain you will find access to a quiet revolution in the manner to which shoulders ( and other MSK) problems are easily solved.
I have just returned from a lecture series I conduct twice a year here in victoria on these matters and am just a little exhausted. A few days in the hammock watching cricket should see me back on top. Go the aussies.
Ask questions by all means, I'll do my best for you.
Cheers