I think this is a good place to post, but I don't know what I am doing.
Anyway, My son had intolerances to dairy as well. I was originally against giving children dairy products fo many reasons, but our doc insisted he needed it, boy was he wrong.
I would suggest to you to first eliminate all processed foods, crackers, cookies, anything that is processed. then start with a very simple diet of whole grains like brown rice, millet, quinoa ( Try to avoid wheat at first because some people have allergies to that.) and fresh and lightly cooked veggies. For protein aviod dairy, maybe even avoid meat if that is in your diet, and focus on beans and tofu. See if that helps with the problems. I always think "if it grows eat it, if it doesn't leave it" . Good luck.