Recently visited a Prof. of neurology. He diagnosed the condition neurologic amyotrophy. Basically a viral attack on the thoratic nerve. Symptoms are high pain in shoulder area 1-4 weeks, followed by some degree of paralysis and muscle wastage. Good news most people make full recovery. Did some research 80% recover in 2 years, 90% in 3 years, I’m hoping to beat that although last month has not seen any improvement. There’s no effective treatment, just time. It’s more common than people think. There’s no point doing MRi , there’s nothing to see. It’s often triggered after an immunization, or post operative stress or child birth , although I don’t fit into any of these categories. Do some research on the condition, I think this may be the issue with some of your office.