Pain in the top back of Shoulder

I have had 15 rads and two boosters with 2 boosters to go. I now have constant pain inthe top at the back of my shoulder. Tried paracetamol and co codamol and stiil have the pain. Anyone else have thus I had rads to the top if my shoulder, clavical, under arm and breast.

I had awful pain but caused by being hunched in pain for so many months. The badly fitting soft bras and cording…are you moving your arm and thinking of posture? I told my bc nurse who referred me for physio.