-Essentially, all 'problems' that we deal with are made up in our head. Thoughts are VERY important! the key to being happy is to be able to control your thoughts! YOU can reduce the effect of your problems by stopping the flow of negative thoughts! Problems are only created when we get a rush of unpleasant thoughts of future scenarios. In reality, it is not as bad as we think it is! So, the key is to stop the flow of thoughts and use a rational approach when solving a problem!
(you can try meditation to learn how to control your mind)