go crazy
go insane
go mad
go doolally

All three went insane and died about two weeks later.

Being rich here is a good way to go insane.

One and all they were looking at him as if he had gone insane.

The woman looked as though she were going suddenly insane.

Really, I though, my main problem is to keep from going insane.

Or else just getting out of the house before they went insane.

You'd go insane if you thought about it too much.

She could just make out people over there running around as if the world had gone insane.

If he didn't soon she was going to go insane.

Who wanted to sleep when the world was going insane?