This difficult time is a fantastic opportunity for you to really address your food demons
Why is it that you are desparate to eat? What do you think you will get from eating? What situation and how are you feeling at the moment that is making you desparate to eat?
It is the difficult times that dictate just how quickly we get to our goals. Not only that, if you can really learn to deal with this demon that is pulling you towards food then you will have a head start when it comes to maintaining your weight loss. If you don't deal with you food demons then it will be harder to maintain any loses you acheive.
I would advise you to stick to your diet by doing whatever you need to to get you through this evening and then think about what happend tonight and what coping strategies you can put in place ready for the next time you feel tempted. This way you will be making things easier and easier as time goes on