DEPRESSION IS NOT dramatic, but it is total. It's sneaky--you almost don't notice it at first. Like a cat burglar, it comes in through an open window while you're sleeping. It takes little things at first: your appetite, your desire to return phone calls. Then it comes back for the big stuff, like your will to live. The next thing you know, your legs are filled with sand. The thought of brushing your teeth fills you with dread, it seems like such an impossible task. Suddenly you're living your life in black and white--nothing is bright, nothing is pretty anymore. Music sounds tinny and distant. Things you found funny seem dull and off-key. I