To be at your wits' end To be so worried, confused, or annoye | EngVestors Advanced

To be at your wits' end
To be so worried, confused, or annoyed that you do not know what to do next;
Ума не приложить. Быть в растерянности, в тупике

At last the little money which I had saved began to run short, and I was at my wits' end as to what I should do;
I'm at my wits' end with my daughter. She would not listen to anything I say!