The key is Surrender. Give up. Give up the outcome. Give up and you'll get Slack.
If you have a fear, there is often a fear of fear, because you worry that by fearing something you will actually create it, hence there is this second level fear, a fear of being afraid. Which is even worse.

What can one do when we have those moments where we think the worst, then worry that by thinking the worst we may have given that outcome power, fueled this fear with our fear.. what can we do.. the only thing left to do is to fear more, not fear, blow it all out of proportion.

If you're worried about something, make it worse in your head, and worse, as bad as it can possible be and triple it. By this point it will be but a caricature a most unlikely event which will help you get over it. Like when you repeat a word too many times, it stops having any hold on you, it stops making sense. Blowing a fear out of proportion makes it loses its power on you due to its cartoonish impossibility.. and then you breathe, and you're much better again.