I have health anxiety for time to time, and now I got into a rabbit hole about my back / shoulder pain being a heart attack. I had the first episode of pain a week ago, felt quite alright the past few days, but today I feel pain again in my left back/shoulder blade. Also a bit breathless and tight now but that might be my anxiety. Can anyone reassure me? Would I be able to tell whether it’s muscular pain and tension, or a heart attack?