It started to manifest itself in 2002. I worked too much, had too much responsibility. I went into a decline and 2005 it all went awry because of change in circumstances I didn't have the resources to cope with. I was wise enough to quit my job, but it was too late. Anything I tried after that wouldn't succeed.
It's a condition where it's hard to reflect on yourself. To see your personal condition. And accepting it, even less. I couldn't.
One day I stumbled upon a stress test and took it. Bang! Almost full score. Then I took notice of myself, started analyzing my condition, and realized, "I'm a burn-out. God dammit".
That was 2007. I've been laying low, really low, since then. Living off my pension. Recently I realized I was better off again. I could read book again. I even felt an urge to start some coding again. I took a stress test again. Much lower score, great!. But right there was also a test for depression ... I took it. Bang! Almost full score. "Now I'm depressed. God dammit".
That was shocking. But I have this strange feeling, that depression is much easier to deal with. I'm growing in my capabilities. I can learn again. I believe I'll become reasonably functioning again. Only time will tell. And time it will take. I can wait. I want my life back.
I could give you details quite similar to SMrF's comment. Read that, and take care.