be beside yourself

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

estar fuera de sí, estar descontrolado

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.
Estaba fuera de sí de dolor después de perder a su mascota.
He was beside himself with joy when he heard the good news.
Estaba fuera de sí de alegría cuando escuchó la buena noticia.