Have you ever taken a vacation? Did you enjoy it? Were you anxious to get back to the job when it was over?
If those questions don't help, then I would recommend immediately planning and taking a good vacation (two weeks or more) before the end of this year and trying it out. Include a few off days at home after the trip. No contact with the job during the vacation -- make it a clean break. That may help make up your mind whether you're ready to quit or not.
Two weeks... wow. I turn 50 this year and have never left for more than a week.