Just remember it is never what happens to you thats the problem, it is how you react thats the problem.
So something happens – you then deal with it by worrying, analysing, avoiding catastrophizing, and so on. This behavious stresses your system and then induces physical and mental symptoms which you then worry about, creating a feedback circuit. When you stop this, you will grafually start to feel better and less anxious. It takes time though, so be patient.
Basically you need to consciously step out of this behaviour. Easier said than done. But you need to practice to be aware when you get lost in your minds worries, and stop adding fuel to it by believing it, analysing it etc.