Hi,
so glad that you are "telling" the dr your plan. You GO, Warrior Mom! Assertiveness works in the dr's ofc.
We sort of use the Feingold diet. In fact, I just bought a 72% chocolate Ghiradelli bar instead of any other kind, because it's on the Feingold list. 
See, you don't have to give up everything!
And by "sort of," I mean that for my son, who is once again on lithium, it is more important that he get fluids, than he stay off of food dyes, so I buy him G2m, light blue. He reacts horribly to red, and sort of reacts to yellow and orange.
Also, I home cook most of our meals.
I love the idea that "if you can't understand what's on the label," don't buy it. Just makes life easier.
I have not signed up and paid for a membership to get the printed list, but someday I will.
I have to say, after my first Feingold lecture, I totally gave up M&Ms, my favorite. I was scared to death, to scared even to mourn the loss much. It is a common sense diet.
Also, I have found that when most people are hungry enough, they'll eat anything, especially if it's left out on the table, like grapes or other fruit, or homemade bread. Just walk away and don't make a big deal out of it.
Yes, we noticed behavior changes--positive changes--when we started the Feingold diet. Much less irritability. And sometimes, it shows up the next day, and can catch you off-guard. We are also gluten-free, and that really makes a difference. Even my son admits it, and he doesn't want to admit anything.
