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

1.
어쩔 줄 모르다, 감정에 휩싸이다
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.
그녀는 애완동물을 잃고 슬픔에 잠겨 있었다.
•
He was beside himself with joy when he heard the good news.
그는 좋은 소식을 듣고 기쁨에 겨워 어쩔 줄 몰랐다.