My Diet Isn't Working

I don't know what's wrong with me.  I can't seem to do the diet I was doing so easily earlier this year.  I was eating 2 raw meals a day (breakfast and lunch) and then a vegan meal for dinner.  I just can't seem to get back into the groove of doing it.  I will try again starting next week.  I have to lose some weight before the holidays because I want to be able to enjoy myself and not cry about every calorie I put in my mouth.