Well, that is awful you are beset with such shoulder and arm pain! I experienced quite a bit of that along with numbness and loss of ability bilaterally in the hands, all of which, with films, emg studies, and scans, led my doc to the very real conclusion I had an ultra severe cervical problem which led to surgeries last summer.

I could not drive, could not hold a pen to sign my name, could not type as I do now, could not hold a fork to feed myself..... point being things were headed to a terrible conclusion if something was not done.

My issue was nerve impingement in the cervical spine, the neck. If doc is telling you there is not a nerve impingement by reason of study of your films, I wonder out loud whether you may have something going on which, although not exactly like what I describe above, may be addressed by physical therapy, chiropractic or acupuncture? Doc would be in the know whether to suggest these possiblilities to you, as I am certainly not.

Prayin you will find both solutions and peace