beside oneself
DISTRAUGHT, overcome, out of one's mind, frantic, desperate, distracted, at one's wits' end, frenzied, wound up, worked up, hysterical, unhinged, mad, crazed, berserk, demented

[TahlilGaran] Dictionary of Contemporary English ▲

beside oneself
to be very upset or excited about something
The boy was beside himself with joy after winning the contest.

[TahlilGaran] English Idioms Dictionary ▲

beside oneself
adj. phr. Very much excited; somewhat crazy.
She was beside herself with fear.
He was beside himself, he was so angry.
When his wife heard of his death, she was beside herself.

[TahlilGaran] English Idioms Dictionary ▲