be beside yourself
US /bi bɪˈsaɪd jərˈsɛlf/
UK /bi bɪˈsaɪd jərˈsɛlf/
1.
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.
•
He was beside himself with joy when he heard the good news.