I relate to everything you said, and I've also read a lot of these posts on burnout. Everyone has the same list of symptoms, and the same mentality.
The unsuccessful seem to be the ones who do nothing, and wait to become unburnt out. I've been applying for a lot of jobs recently, and it's gone very well. I'm likely to have a few offers in the next couple weeks, but I find myself completely dissatisfied with the thought of taking another job. I'm nervous I'll be in the exact same situation after a week, or even the first day, of a new job.
The answer seems clear though, if you still like your job take a long vacation and come back. If you don't, quit your job and take the same vacation. Find a new job after.
That's such an easy thing to say though -- I know because I'm sitting here, still employed, and not fucking off to Australia for 6 months to learn to surf and relax. Sigh.