disturb the balance of one's mind(вывели его из душевного равновесия = disturbed the balance of his mind. The film so disturbed the balance of his mind that he suffered visions of Lon Chaney making terrifying faces at him and shouting. Alexander Demidov)
tip over the edge(Into a state of emotional instability. I think all the pressures at work and at home have tipped John over the edge. Также используются глаголы "push" и "send". george serebryakov)