Are our fear for real..?

Or is there such thing as fear? Fear of what? Fear is everywhere. And it does not choose the time. It is always there. Right? If it is always there then it is better to talk about it in terms of hierarchy. How? Tsunami is both a collective and individual fear. It is a real fear because it comprises both the elements of life and death. But what about fear in failing an exam? What kind of fear is that? Or fearing that someone might not know us. That word `anonymous' is shrouded with mysteries of fear. And I am writing this, why? What do i fear about? Fear of Allah. Should we fear Allah? Allah the Most Gracious and Merciful.