Wow. I thought my situation was a rarity. And yet two others here on Sunday thread with similar events. In 2013 too, I had an EKG as part of regular checkup. My Doc freaked out, called 911 and they rushed me to ER. 7 hours later after an angiogram (same procedure as you two), I walked out of hospital with less than 10% blockage in only artery, nothing in others.
Couple summers I had similar experience...bad EKG...some tests on heart..and nothing found...the way they took the EKG may have been the issue...sitting in an office chair, the “tech” had me just slide down and kinda lay back, lift my shirt so she could put probes on...doc comes back and tells me I have had a heart attack and not to do anything until tests...and then this regular doc wants to get my cholesterol checked...I ask which test...he says, oh just regular cholesterol test...well, I inform him I will get my own tests, because I know the ignorance of most docs about cholesterol...my regular doc got me an in depth test that showed , yes, my total chol is high, but all the other numbers are fine. My breathing problems ARE likely lung related. I am still trying to figure it out. Good luck, Fish.