"It's a piece of advice Dad was given when he was learning to fly, and what he turned to when the plane caught fire and he thought he was going to die.
Deal with one thing at a time. You need to be able to see the big picture, but you also need to deal with the important bits as and when they come.
So now I try to push everything aside in my head and concentrate on one stress at a time. Maybe even write them all down so I can try and completely clear them out of my head until I need to worry about them."