At one’s wits’ end

At one’s wits’ end: 
(estar) confuso,  oprimido, subjugado, inseguro sobre o que fazer

“The confused student was at her wits’ end because she didn’t know what to do after graduation.

 “” Shawn’s wife left him, his children are always misbehaving, and he just got fired. He is at his wits’ end, and he doesn’t know what to do!”

(www.idiomeanings.com)