Crisis and Fear

In my life, I've found that, when faced with a real crisis, the easiest way to deal with stress and/or fear is to stop where you are and let it have an unimpeded moment to rule you, to take over.
Let it in, familiarize yourself with the feeling, saturate yourself in it, and give it time to pass. 5 minutes, 10.
Then cast it aside and continue on.
If you don't, it will lurk at the back of your mind through everything-- clouding your thoughts and subconsciously influencing your decisions, your every step.
If you give the fear and stress the time and attention they deserve, you'll be done with them and move on, the whole situation easier to deal with as you come at it with new eyes, a clear mind and a cool head.
With that taken care of, I've always sat down by myself late at night and made a list of what I had to do for each situation, numbering each item by level of importance, then looking at each item as a separate event, following through with each, then striking it out with a single line once each step was complete.
I'm not saying it works for everyone-- I'm not that pompous or egomaniacal. I'm just saying it works for me.