Exaggerate Your Greatest Fear
I know this doesn't seem like a good idea, but truly it works. I learned it from a fellow Beyond Blue reader who explained on a combox: "Tell your fear to someone else and make sure to be as dramatic as possible, with very descriptive words and emotions. Then, when you've told every detail you can think of, start over again. Tell the entire, dramatic story, again with very elaborate descriptions. By the third or fourth time, it becomes a bit silly."
My friend Mike and I do this all the time. He will tell me how he is afraid he has diabetes, and that his leg will have to be amputated, and then he won't be able to drive a car with one leg, and because of that his wife with leave him, and he will be a single, lonely old man with one leg. Funny stuff, right?