Ooooh I have off weeks a lot; last week I ate burger king and like 20 pieces of Amish Made Salt Water Taffy. The best thing for you to do is to NOT give into those desires, no matter how frustrated you are.
Just envision your goal, keep it in mind and then think back on how much you have ALREADY overcome. Consider whether you want to go back to being the 'you' that you were when you were at your worst. Gather those feelings that made you WANT to loose the weight and push all the desires for the bad things out.
Then listen to some motivational music or watch a motivational show to get pumped.
If you're hungry all the time then consider this:
Are you drinking enough water? Sometimes we feel hungry, but it's a thirst for water.
Exercise is a natural and healthy appetite suppressor (although you probably already know that, since you burn so many calories)
Good luck and remember that you can DO THIS! Don't give up and don't let the off week take your life over