Look at the mind

Use your mind to look at your mind.
Use the mind that is the clean eyes to look and see the status of the mind.

Then use the right Kammatthana to deal with it.

Use the clean eyes to look at the mind.

When the mind wants tranquillity, concentrate on the breathing, using Anapanasati.
When the mind wants to think, think by looking at the truth or using Ariyasaccani, look and see the trilaksana:
Anicca: the uncertainty of all things, all beings, all stages. The changing nature of everything.
Dukkha: Suffering - Sickness and Hunger are suffering. The body is dukkha.
Anatta: It will disappear. Nothing stands the test of time. All things will finally disappear, back to the 4 elements. And so as our bodies. So as good times and bad times.

Just think.