I feel for you. People who have been yo yo dieting in the past often have a hard time. Try a few little tweeks. Keep the carbs a little lower - 15 - 20 rather than 20 - 25. Start drinking green tea - it speeds up your metabolism. And try to excercise a little - even if this is just a short walk in the mornings before breakfast.

If you stick with it you'll crack it I'm sure - and you've got loads of other health benefits to look forwards to.

Good luck.