Hi there
I Will give you my opinion
If the shoulder pain won't go Amat with PT and NSAI, then i think the next step would be a steroid infiltration direct unto your shoulder.
If that won't relieve pain, then i will suggest a Shoulder Arthroscopy, with that procedure most of the injuries can be fix and the pain will go away. Maybe you have a torn rotator cuff as well besides the calcifications. So my advice would be, go to your local Orthopedic Surgeon and see what he has yo offer. Do you take a shoulder MRI?
Best regards!