Writing Crap

I'm currently writing the first draft of my first novel, a YA fantasy (original, I know) and i'm finding it somthing of an emotional rollercoaster.
I feel joy when I come up with new plot twists, but often hit depression as the words flow from me. It's all very readable, I think, and I'm fairly certain (though I may be wrong) that my grammar, punctuation and sentence structure are fine (can grammar be great? I think it's either fine or just terrible, but hey.)
I think part of the problem may be that i'm going too quick. I've written well over 10k in just three days and i'm nearly a quarter way through the story. At this rate I could be done in two weeks. I'm well aware that it will need several more drafts, but at the moment i'm just writing without thinking too much. I'm also following a brief outline that's changing every day.
Does anyone else feel this depressed while writing? It has really hit me today. I have no motivation to write anything (that's why i'm here), but i'm going to force out another 2000+ words later (not sure if forcing is a good thing).

Also, my hands are killing me (around knuckles) from the typing.

Thank's for listening.

Thanks for all the comments folks. Its good to know i'm not alone.
You'll be happy to hear that since last I posted I finished the chapter I was working on. 1600 words. Most of them crap, maybe, but it does feel good to have gotten them out. Thanks for all the encouragement.

LeftUnsaid said:

An initiation, eh? I finished my first draft in a dramatic effort last night. Do I get a full initiation too?

Seriously though, since I have finished I feel I have rights to answer. Especially since it all sounds very very familar and fresh in my memory. My beginning started exactly like yours. ANd throughout the continuance of writing I felt a whole variety of things, and depression was near the top. My words slowed sometimes too, especially during moments of doubt! And of course the whole time I thought for sure I was writing crap. But every single time I would glance through something I wrote and forgot about, I would find so much of it to be worthwhile and I had to stop and remember that those are my words. This is my story I'm saying wow too.
So, ultimately, just go with the crap and keep on going. Today I live proof of the seemingly impossible being possible. Let's all take a lesson from that, or something. I can't even count how many times I wanted to quit.
Just know when to take a break to recharge, before you deplete your resources completely.

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Congrats on finishing your novel. It's refreshing, in a sort of sadistic way, to know other people have gone through some pain along the way too. Are you putting your manuscript away for the prescribed weeks/months? That's something i'm not looking forward to. I'm fidgety and can see myself waking up at 3 in the morning with an unnatural desire to edit.