It doesn’t exist.
That nightmare. That fear of something, of everything, going wrong. Standing naked before a stadium of people. Your business failing and then your life is over. Getting fired and then your life is over. Losing your lover, your spouse, and then your life is over.
These are only thoughts in our mind. Most terrible things don’t happen. And if they do, then we face them then, and only then. Let us not suffer needlessly every waking moment till that bad thing that may never happen happens.