Amadeus - I hve sometimes thought of calling in sick, but haven't got round to it. Not sure what excuse I put down...?
If I'm feeling really low, I'll chat to a mate of mine via e-mail, or spend time on here to get strength. And I just sit in my corner at work, listening to my music and switching off. I know I am not productive that day, but I really cannot bring myself to calling in sick. It's a lot easier if you have flu or something, as people can physically see you are sick