Side effects of vaccinations, anecdotally, are numerous.
Sudden cardiac failure is just one among them.
Don't look for the data, you won't get any.
You can go into denial mode and refuse to accept what many people have now started realising. Denial mode involves statements like "science doesn't say so", and "the government has not said so". The belief in "science", and "authorities", while being very endearing, is very endangering.
Desperate denial mode, a natural human reaction, involves not wanting to look at the mounting evidence, and repeating to oneself, "all is well, all is well", because:
One has taken the vaccine,
All family members have taken the vaccine,
And, if you are a senior officer in any organisation, you have repeatedly endorsed the vaccine, admonished people who have not taken it, and been an active part of the brigade implementing it in your organization.
In such a situation, it is but natural that you do not want to see anything to the contrary.
Another reaction is to dismiss the whole thing as "it is over".
It is not over. Khel to abhi shuru hua hai.
Face the facts.
Make up your mind about what you want to do for self and family.
If you are part of an organisation and responsible for implementing "vaccine mandates", prepare to operate in an illusory world. That should be easy enough if you have a lot of experience working in organisations.
Ar the very least, acknowledge that people should be able to make their own choice in the matter.