I had acute Myocarditis taking Azythromicin worried about heart stopping side effect

My doctor prescribed me a single does of Azythromicin.

I am horrified about the possible heart stopping side effect it can cause.

Three years ago I had acute Myocarditis. This year I had a full check on my heart including ekg, bubble test, ultra sound, blood tests, etc and everything came back as normal.

Is it safe for me to take a Z pack?

I cant take Cipro or floroquinolones and Doxy isnt working for my current infection.

Should I be worried?

26male 175 lbs 6’5