Does anyone think that there's more than one 'kind' of depression?

I don't know about you guys, but I can't help but feel that just the label of 'depression' doesn't really do things justice in describing how someone feels. I mean if you take a physical illness like say, loss of appetite for food, although that might be the effect, there's always a deeper description to explain the cause, say, food poisoning, or a flu virus, or some kind of infection.

And it just seems that saying someone has depression, is just like saying they've lost an appetite for life, but without the deeper description you'd otherwise get with a physical loss of appetite. Plus the worst feeling in the world, is feeling sad but not having a clue what the cause is, which is exactly what depression can do and only leads to feeling even more lost and depressed.

Currently I've come up with three different 'types' of depression. There's almost certainly more, but these are the ones I've stumbled upon just through experience:

Type 1) Essentially this is when you just think so little of yourself, that feel you have absolutely nothing to give to the world, no sense of place, purpose or belonging, like every feeling you have is just weighing you down, dragging its heels all "but what's the point in trying? It's not like we're going to amount to anything? We're so awful/fat/pointless etc that nobody's going to like us".

Type 2) This is where you've more or less forgotten how to feel things outright. It's not that you 'hate' anything or feel really negatively about anything, it's almost that, your psychological immune system has just got so exhausted, feeling awful things for the past few months or years or whatever it my be, that all feelings are just shut down and, you're pretty much just an empty shell drifting across the currents of life, I suppose.

Type 3) With this one, you still have the ability to feel, but only one emotion, and that's the one of death. That, somewhere along the line you've had a traumatic experience or severe panic attack perhaps, and just, that reptillian urge to worry about your survival, just got a strong and so intense that once it ignited from that point, it's just never burnt out and it's just all you can think about from this point. You just see nothing but death and decay inside you, and therefore nothing but death and decay all around you, and there's no 'off switch' you can hit to see nothing but life again.

It seems that the unifying factor in all instances, is effectively a vicious circle of feeling hopeless/powerless, which leads to seeing little point in life, which then leads to feeling hopeless and powerless as a response, causing you to feel little point in life as a response to that, and that snowballing and snowballing until every day you have to battle through an avalanche. That's the underlying essence of the feeling, but I just think that if we're really gonna get the better of this thing, it really might help if we can collect and categorise all the known causes.

I'd love your thoughts on it anyway :) Feel free to add any other types, if you've seen them around :)