If you can control the ever present urge to speculate you can manage and control you fear, channeling it into areas of productive learning. There is only one way to effectively control speculation. Subject it to fact. Most conversations, including news reports, are made up of a combination of speculation and fact. The trick is to learn how to spot the facts and separate them from the speculation.
Speculation breeds speculation.
This is something people in law enforcement learn early in their careers. How to spot the facts. This process is called active listening. When you listen to other people, try to separate fact from fiction and speculation. It's easier than it sounds and after a little practice it almost becomes second nature.