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

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.