There gets to be a point where you have pushed your body so hard, it needs a break. Working out with intensity and dedication can really take a tole on your body.
Your muscles need time to heal, and when you get to a point where you're not seeing any gains and you body feels like it is worn out...STOP take a full week off and let your body catch up and heal.
Muscles aren't the only thing that you exhuast while working out-tendons and ligaments take on a lot of strain as well and a week off will surely make them feel fresher.
This is NOT a free pass to eat anything you want. Maintaining a strict diet at this point is essential to your longterm, over-all goals.