be beside yourself
US /bi bɪˈsaɪd jərˈsɛlf/
UK /bi bɪˈsaɪd jərˈsɛlf/

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。