This fear constantly arises from the always-impending danger of the evaporation (elimination, destruction) of the positive mood/emotional ‘high” which gives the person a sense of being a ‘Being’. This good-feeling-about-self can be eliminated by subsequent events, by time, by the person’s subsequent actions, or by the actions of others. Since the person’s whole experience of being “someone” – and avoiding the utter terror of feeling invisible/unreal – is dependent on this feeling, that experience is distressingly evanescent. One lives in fear it will go away again, and it always does.