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Don't catastrophize

One way to sabotage yourself is to take a single event and treat it as an ongoing source of negativity. "People who are unemployed do this a lot," says Rego. "They've lost their job because of the economy and they personalize it."

It's also unhealthy to catastrophize—focus on the worst imagined outcome, even if it's irrational. For example, don't let concerns about money escalate into the conviction you'll soon be homeless.

Instead of thinking, "I'll never get another job," try to say to yourself: "I will get another job. It just may take some time."

Next: Stop ruminating