Shell-shocked

I don't even know what that means, but it sounds appropriate...

You know that feeling when you're having a dream, and in it you're walking down a street, when all of a sudden you trip or stumble or mis-step? And it jolts you awake all of a sudden, your heart is rushing, and half the time you can't even remember why? Like you just did a mini free-fall, and landed in your bed.

I think that about describes this moment.