Be Careful Thinking About Your Problems.

Non external problems are increased multifold just by thinking about it again and again in the forms of thoughts.

In neuroscience, its "use it or loose it", more you use it more the pathways are strengthened.

You cannot supress the thoughts directly, but you can ban the words and sentences you use to create those thoughts, closely observe and not down the common words you use thats related to you problems. With practicing these with discipline you would notice the decreased intensity just after few days.