run oneself into the ground(to work so hard that you become very tired or ill: He'll run himself into the ground if he doesn't take some time off Taras)
scared witless("At first I thought it was someone messing about, but then he glided away and walked straight through a solid wall at a dead end." Garry had to be carried away from the pit on a stretcher in a hysterical state, and later declared himself 'scared witless' by the encounter. (Janet & Colin Bord, "Unexplained Mysteries of The 20th Century")ART Vancouver)
