Write things down.
Putting your concerns on paper allows you to return to them later. You don’t have to dismiss them entirely, and you can feel comfortable knowing you will revisit the concern. Also, the act of writing engages your mind and reduces the power of racing thoughts. When thoughts are in your mind, they feel chaotic. Putting them on paper organizes them. Use a notebook or a designated computer document. Once you’ve taken a few minutes to organize your thoughts on paper or onscreen, your mind should be calmer. If you want, set aside a time limit for thinking about them before taking a break and coming back to them later.SOURCE