This is something I've noticed, and i'm curious if anyone else has the same symptom. Second to ectopics, chest/stomach/throat tension is my worst symptom. I can feel myself actively tightening these muscles but I can't seem to really stop it. it can last for days. My breathing feels weird when this happens, also. But, I've noticed when I do this, My PVCs kick up and they seem to have some connection to how I'm breathing. Which doesn't surprise me, actually. Anyone else in the same boat? if so, any advice on how to remedy it?