freaking out

go crazy lose it

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