Racing thoughts may be replays of past events which generated anxiety or sadness for you. They may also be worries about things that could happen in the future. They are strings of thoughts that are blown out of proportion, have a pattern, consume time, and often have no rational conclusion
Racing thoughts—fast, repetitive thought patterns about a particular topic—are a common feature of anxiety and other mental-health disorders. But they can happen any time you are in an anxious or stressed state, even if you are notexperiencing other symptoms.

When thoughts like these flood your mind, they drain your energy, stop you from living in the present moment, and can create a loop in your brain that feels difficult to escape. They can also make it harder to concentrate and accomplish daily tasks, and impair your memory and sleep.

Having racing thoughts is often disturbing and frightening because it creates a sense of being out of control. But having racing thoughts does not mean you’re out of control or crazy. It does mean that you are anxious and that your stress level is higher than usual.

So helpful Ideas : Returning your focus to the present will help you accept and let go of what you cannot control. It will also help you realize that you can’t change the past, and that the future hasn’t happened yet, so it’s a waste of time to keep thinking about them. (This doesn’t mean that you are unaware of what happened in the past or what is about to happen in the future.) Try taking a deep breath and asking yourself how you are feeling right now.
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.
And If you find that you are not able to get racing thoughts under control, consider consulting a mental health provider. Anxious thoughts can be part of a mental health disorder that professionals can treat effectively with psychotherapy, medication, or a combination of the two.