I used to be a worrier, but I've learnt how to deal with it now. I try to look at things as fitting somewhere in one of these circles -
so something sits either in my circle of influence (where I can do something about it) or my circle of concern (where i can't, but it bothers me).
The more I concentrate on things in the concern circle, the more I worry, the smaller my circle of influnce gets. After all, I can't do anything about those things so the worrying isn't actually going to acheive anything anyway. Things here would be the recession, my surgery date, war, the weather etc. By acknowledging that I have no control over these things, and that worrying about them is pointless, it makes it easy to let go of that worry.
If I concentrate on things in the circle of influence, things which I can directly influence and control, and work to change whatever it is that is worrying me, then that worry can disappear. Things in this circle might be the state of the kitchen, my personal budget, the state of my marriage, my weight etc. But it doesn't mean I can worry about these things, I have to be proactive about them.
If I do this, then gradually my circle of influence grows, so that I have more influence over things that directly affect me.
OK gotten a bit deep there lol, but those two circles really have stopped me worrying and believe me I was a person that would worry if I didn't have anything to worry about! It's the work of Covey by the way, not taking the credit