— I understand you, what you don't know is that you are worrying about things happened yesterday and something may happen tomorrow. Am I right?
— Yeah, quite right! So what's the solution?
— Since you've known what you are worrying about, you will know how to overcome it. My advice is don't worry for yesterday or tomorrow, that's useless, yesterday has gone, tomorrow hasn't come, you needn't to worry about them. What you should do is living for today, keep happy today and you will be happy for all your life.
— I am clear now, thank you very much!