1) Take a deep breath.
Breathe in deeply and produce life. Such as breathing exercises. Or just focus on the inflow and outflow as if meditating. Then the head will not be able to think about anything else and will focus only on breathing.

2) Think only about the present moment.
If you think you've calmed down from the breathing exercise, just think about what you have to do in the moment and do it. It also makes you not think about anything.

3) Think about what you are thankful for.
What luck do you have? What is still there, Think back on the little things that you have got compared to others. Sometimes people get confused because they only see what they don't have. That's why you should think about what you have to be thankful for.

4) Be alone without thinking about anything.
Sometimes, when I get confused like this, it is also peaceful to sit alone in a peaceful place. Whether it's breathing the fresh air around you without thinking about anything. Some kind of god has lost his mind and gone to the water. Try doing something relaxing, like sweeping the floor.

5) Divert your attention to a hobby.
If not, you should try to do something that will draw your attention to your hobby. Some of them love to paint, so while painting, they can only concentrate on painting. reading, You can do something you like, such as making a craft.