You're doing an extreme diet - so it can be hard to get back on once you fall off, but remember when you do go back on the weight will come off quickly. Have a day of distraction activities planned and don't give yourself time to think about food. When I feel really low I plan about two hours at a time. Clean a room, have a cup of tea, do a bit of garden and then it's time for a pack. Think about what you have done when you have been successful and how being successful makes you feel. You will get there one baby step at a time.