I have just started a meditation course to try and relax and control my thoughts a bit more. I had my first hour last week and it was quite tricky to focus at first (to stop all the little thoughts coming in and distracting me). But, the guy said that the more I meditate, the easier and more natural it will become. So, I have taken to trying 10 minutes a day for now.

So it sounds as if meditation might be a good thing to look into, to help you control your thoughts.

TinyClownFish