Freak Out

lose it go crazy go nuts freak out lose control of oneself lose one's mind lose one's temper fly off the handle hit the ceiling go ballistic go bananas go berserk blow one's top flip out lose one’s cool lose one’s composure go off the deep end crack up break down blow one's stack wig out go ape blow one’s mind go haywire flip one's lid work oneself up blow a gasket