If you're worried now, let me ask you a simple question, why?
What is the reason that you're worried?

Is it the past that's making you worried? If yes, then you've got to accept it and let it go. One thing is for sure that you can't do anything to change it. It's already done and the thing you can do instead of worrying is to just accept it.

Or, is the anticipation of what might happen in the future making you worried? If it's...