My anecdotal experience doesn’t chime with this. I got myocarditis with a covid infection in Apr 2020. Then again, starting almost exactly 24 hours after my first vaccine dose just as other flu-like symptoms kicked in.
The rates are low, but I’m pretty sure it can have this effect.
I think any immune response could trigger miocarditis in you. You got it after a covid vaccine but you might have gotten it after another vaccine or a flu or a cold.
Probably prior infection to covid put you at greater risk of getting miocarditis for any reason.
I hope it'll get better for you in the long run. Take care.
The rates are low, but I’m pretty sure it can have this effect.