In my Linchpin review, I made a reference to the classic science fiction novel Dune. In the novel, the Bene Gesserit (space witches) recite a litany against fear when they're in danger:

I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path.
Where the fear has gone there will be nothing.
Only I will remain.

Maybe it'll help you when you're overcome by your lizard brain.