You must be good friends right now with your surgeon based upon all the surgeries you have been through. It seems that this “hatchet” pain in your right shoulder has never been relieved by your prior surgeries. Correct, or did you get temporary relief that returned after you developed a pseudoarthrosis?
Did you ever have positive diagnostic blocks (a numbing injection around one of your neck nerve roots that gave you temporary pain relief) to demonstrate the pain generator? See https://neckandback.com/treatments/diagnostic-therapeutic-neck/
The nest step is to determine where the pain is originating (which could even be generated by your shoulder). Diagnostic blocks would be that pathway.
Dr. Corenman