be beside yourself

US /bi bɪˈsaɪd jərˈsɛlf/
UK /bi bɪˈsaɪd jərˈsɛlf/
"be beside yourself" picture
1.

情緒失控, 欣喜若狂, 悲痛欲絕

to be overwhelmed with a strong emotion, such as anger, grief, or excitement, to the point of losing control

:
She was beside herself with grief after losing her pet.
失去寵物後,她悲痛欲絕
He was beside himself with joy when he heard the good news.
聽到好消息時,他欣喜若狂