m a 28 year old male in decent physical condition. About 2 months ago, my heart
inexplicably. I panicked, thinking it was a heart
attack, and went to ER. They checked- no heart attack. I did a cardio test and had an ultrasound- all good. So, things were fine. Then, about 2 weeks after all this, I noticed I was having trouble breathing from my 'upper' chest- the upper chest muscles felt tight. I used my inhaler (I have very mild asthma), which didn't help.