go bonkers

break down collapse flip

succumb yield

become deranged become insane blow one's mind blow up bug out give way go crazy go to pieces lose it

be calm

freak out go crazy

become demented become psychotic blow a fuse collapse come apart at seams decline derange deteriorate fail flip out go nuts go off deep end go off rocker go out of mind go to pieces have breakdown sicken

be calm

freak out go off lose it

blow a gasket blow one's mind blow one's stack blow one's top crack up flip one's lid flip out fly off the handle go ballistic go bananas go batty go berserk go buggy go cuckoo go daffy go haywire go kooky go loco go loony go mental go nuts go nutty go off one's rocker go off the deep end go off the wall go psycho go wacko go wacky lose control of oneself lose one's cool lose one's mind wig out