What is a four-word idiom to describe being very worried or afraid?

Idioms describing extreme anxiety or fear are:

Fear, fear, panic, fear, anxiety, fear, anxiety, sleepless at night, anxiety, fear, fear.

First of all, be on tenterhooks.

Definition describes being very worried or scared.

Source Wu Ming Cheng En Journey to the West The seventeenth time: "When all the monks heard it, they were all frightened and made a wish to heaven."

Second, fear.

Relieve one's inner fears and feel very uneasy.

The source "The Biography of Wang Han": "People are at a loss in business." Don Yan Shigu's Note: "Being in the camp means being scared."

Third, panic.

I'm scared, flustered, and I'm acting crazy. I don't know what to do.

Source: Biography of Hui Yuan in the Northern Qi Dynasty: (Yuan) Xiao You was executed, panicked and embarrassed. "

Fourth, fear.

Definition description very scared.

The source comes from Yuan Anonymous's "Sazhenren Breaking Peach Blossoms at Night".

V. worry

Definition describes it as very sad.

Source "The Book of Songs Zhao Nan Cao Cao": I have never seen a gentleman, and I am very worried.