That's the real problem here. Turning off the TV and stopping reading the news, crafted precisely to generate anxiety, is the solution. It will probably be a nothingburger, but the media need something to divert from the "mysterious" heart attacks. Remember, two years ago covid was presented as a very deadly virus and it turned out to be only dangerous for a very specific and small segment of the population (70+ yo and obese people).
b) Delta strain of COVID is affecting younger people at increasing rates [1] and at least here in Australia we are seeing hospitalisations with far more young people than in the past.
https://www.abc.net.au/news/2021-08-07/delta-variant-of-covi...
Your link is pure fake news. It's an article trying to pass a known side effect of the mRNA medication (myocarditis) as stemming from the virus. Also it's from the press of an authoritarian country that is deporting people into camps...
b) Australia is not an authoritarian country by any definition and ABC News is highly respected as an independent news source.