People who doubt depression is a 'real' illness have quite clearly never experienced it. The problem is that there seems to be some confusion between normal, everyday feelings of being a bit down and depression, which is very much a real condition that kills many people every single year.
So you missed the bus this morning and you got wet in the rain, now you're at work and you've realised you haven't got your lunch with you. You're cold, wet, tired, hungry and feel a bit teary. Your boss is yelling at you for no particular reason. You've got another 6 hours before you can go home. You feel down, which is understandable.
This is one thing.
You feel as though every step you take, every little movement requires so much energy that you just can't do it. So you're sat on the sofa and really in need of a drink, but you don't go and get one because you haven't the energy to lift yourself up and walk to the kitchen. So you lie there, staring at the wall, trying to think of reasons why you should remain alive. Maybe you're crying, maybe not. Maybe you wish you could feel something, anything instead of this permanent numbness. Of course, we all have things to do - school, work, whatever. And you have to do it. So you force yourself to get up each morning, even though you really just want to stay there and hope you disappear. Force yourself to function, depsite the darkness that seems to hover around you, despite feeling that there's nothing to look forward to, nothing to enjoy or smile about, nothing in the future that might lift the weight you're carrying off you a little. Everyone hates you, including yourself, and you just want to be forgotten so you can crawl up in a corner and die.
This is quite another thing.
Everyone experiences depression differently, by the way, so I don't want to make out that the above represents the reality for all sufferers.
For those people that say that depression isn't real, that the sufferers are just wallowing in the misery that everyone feels from time to time and that they should just pull themselves together... wait until it happens to you. Then you may feel differently about it. And if it's attention seeking, why is it that people with depression rarely tell anyone? Odd way to go about drawing attention to yourself, isn't it?