This is going to sound crude at first but bare with me. Recently I used two fingers to press down and massage the muscles and ligaments running along the ridge of my chest towards my arm pit and felt a huge movement of nerves right where I get the pain for PCS near the middle of my chest. Anatomically the area is halfway between the nipple and arm pit.
Have you tried this? Just try and massage and manipulate that area and side of the chest that runs up to your arm pit. (Another way to find the muscles / ligaments is to start from your armpit (at the very front, The corner between your chest and shoulder) and feel around for the ligaments, once you've found them work your way down along (physically pressing down with your fingers causing them to move with the force of your fingers) them getting nearer to the centre of your chest. Could these be the muscles / ligaments we feel the pain in and not our hearts?
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