If you find out anything, please let us know. I didn't have surgery, but I have these same symptoms. I have keloid scar tissue trapping my subclavian artery & vein, after having my broken collarbone pinned after a serious car accident. for over two years now, I have had what I call "the weird breathing thing" where certain positions, bending over, laying flat, laying back at just certain angles, make me short of breath or feels like I'm just not breathing. Bending over immediately makes it feel like there's so much pressure in my head it's going to explode. So can laying flat, which I mostly avoid because of "the weird breathing thing." For over two years now, no one has even attempted to explain it. So if you find out anything, please tell it here. If I get any info, I'll tell you.