I've been trying this lately, I read about it in a book. It said when a worry comes you should say to yourself that it's a legitimate worry and that you will worry about it at a specific time, say 3pm. Then at the appointed time you should sit and worry as hard as you can about all those things that you're concerned with for 15 minutes. I start listing them, 'what if I can't drive', 'what if I can't get all the farm chores done', 'what if the sky falls', 'what if a sinkhole opens and eats my house', etc. You'll notice that all of your worries start with 'what if'. And you'll notice that you run out of things to worry about before the time is up. If you do, you must re-worry about the things. It never fails to make me laugh before I'm done. It sounds so stupid to say 'what if' over and over, it makes you realize that most of the things you worry about never happen and the ones that actually do are never as bad as you thought. It also makes you realize that you can control your thoughts by putting off the worry to another time. Try it and have a laugh!