Thanks very much t_coffee_or_me for your reply

let me tell my story
I have been working in Qatar for few months and than resign and return back to my country.

The problem was my work.
When I were in Qatar, no many work for me to do.
Every day is very free one.
Then there are some work for me which I am un-able to do.
So instead of continue there, I better resign.
not because of the salary, actually i am very happy with the salary.

My worried was, if I don't resign, later the boss find out that I didn't do work and unable to produce result.
I might have problem to get exit permit later.
Imagine, if the boss stop paying my salary, and I can't return to my country, and I have to continue paying the high rental for my apartment and expensive foods.
Soon or later, all my saving is going to finish, what am I going to do after that?

You see, I just couldn't stop my paranoid thinking.