be beside yourself

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

estar fora de si, estar dominado por

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.
Ela estava fora de si de tristeza depois de perder seu animal de estimação.
He was beside himself with joy when he heard the good news.
Ele estava fora de si de alegria quando ouviu a boa notícia.