Critchley, Simon. "BEING AND TIME, Part 5: Anxiety." GUARDIAN July 6, 2009.

As I showed in the last blog, moods are essential ways of disclosing human existence for Heidegger. Yet, there is one mood in particular that reveals the self in stark profile for the first time. This is the function of anxiety (Angst), which Heidegger calls a basic or fundamental mood (Grundstimmung). Safranski rightly calls anxiety "a shadowy queen amongst moods". Anxiety makes its appearance in Division 1, Chapter 6, where Heidegger is seeking to define the being of Dasein as what he calls "care" (Sorge). It would take many more blog entries than I have at my disposal to lay out in adequate detail the structure and meaning of care. But we can get more than a hint by looking at anxiety. . . . Read the rest here: http://www.guardian.co.uk/commentisfree/belief/2009/jul/06/heidegger-philosophy-being.