Beside myself

Extreme joy, anger, etc, brought on by a situation that causes one to be "out of one's mind" with that emotion.

"Beside" was formerly (15th through 19th centuries) used in phrases to mean "out of a mental state or condition, as 'beside one's patience, one's gravity, one's wits'" (Oxford Engl. Dict.), and that use survives only in "'beside oneself': out of one's wits, out of one's senses."

I was so beside myself looking at all the women on the beach that I didn't hear my wife yelling for help.

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