Not to sound like the dirty hippie that I am, but journaling will help you get in touch w/your feelings, and give you insight as to the reasons behind everything you do. It's a great help to go back & see how far you've come, also.
You can journal about dieting, or about life in general w/info about your eating exercise. You can also food journal, which is writing down every single thing that goes into your mouth--vitamins, meds, food, beverage, gum, etc.
I think it would help a lot. Sometimes there are things you can't/shouldn't say to anyone. But your journal is not there to judge, it's just a place to vent.
I hope this has helped.
Good luck on whatever you decide.