Force yourself to use the optimist's explanatory style: 'The situation is temporary. The effect will be limited, not pervasive. And it's due to external causes.' If you just can't make that work for you, refocus your attention...Turn your attention in a totally different direction for the time being. Replace the distressing thoughts with other ideas. Distract yourself.

Hard Optimism: How to Succeed in a World Where Positive Wins (ed. McGraw Hill Professional, 2006) - ISBN: 9780071485456