Why won't my brain just calm down?

it is because of the neurons they work 24/7 and chemical reactions which occur in your body you cant stop reliving the past events in that way.

maybe something is stressing you, or you fear something that would happen, I suggest to follow the anxiety guide in order to calm you down

chances are you're thinking too much. you have too much going on and you need to step back for a bit and relax. clear your head with something you enjoy doing. listening to music, yoga, whatever it may be to help you relax.

This can depend on a variety of factors such as stress and sleep. Try to sleep for at least 8 hours, eat healthily, practice physical exercises and book yourself a time to rest and get rid of all the stress from work or school is a great solution.

It's our brain's job to be active! But asking a question like this tends to exacerbate the situation. Instead, we have to have our tools and go-to's to help us calm down when we're feeling internally active. What does that look like for you? Deep breathing always allows us to hit the "reset" button. It allows us to calm our entire central nervous system. Stay with the breath, always!

Probably because thoughts are raising through your mind and it's becoming harder to stop them. USually if you breathe in and out and relax a bit, it stops

You're brain might not calm down because it is trying to solve millions of different tasks and worry as well as keeping you cautious and awake in case of any danger.

Just stop everything your doing. Take a moment to just breathe. Breathe in and out. Clear your mind as best as you can. Think if just quiet. Just keep breathing in and out. Then just think of a happy memory that you will never forget