Sadly, nutrition is not the only reason we eat. Sometimes we eat for comfort, or for how it makes us feel. If you fall in to that category, then your appetite control is not going to help. I'm not really sure what to suggest except, make sure there's nothing bad to eat in the house, so that a momentary temptation is harder to act on, and prepare yourself for outings where you know there will be things you don't want to eat. Make yourself one really nice dextrose sweet a week ( but make sure you can have it gone that night, the point is to have one treat a week to look forward to ). I am a guy, as you know, but I do think the book suffers from a male perspective, because I get the impression that ladies are far more likely to have these sort of issues ( although I'll put my hand up and say that there are times when I whip up a quick dextrose sweet to over come the cravings that arise ).
The most important thing is, you don't fail until you stop trying. If you make a mistake, learn from it and keep working at it. That's not failure, that's constant improvement and working to your goal.