About the potatoes - we're allergic to those here. I figured since she had the corn/ gluten allergy she may have more allergies hiding behind the others. We can not eat anything from the nightshade family (tomatoes, potatoes, eggplant, peppers, and the list goes on!) unless it was grown by us, those seem to be OK as long as we don't eat a lot. When we eat veggies from the nightshade family, all of our stomachs swell up to make all of us look pregnant, and pa's psoriasis flares up.
I was tested positively tested for an egg allergy when I was about the age of six. I have eaten eggs my entire life and continue to eat dozens a week, without any bad affects. I didn't have a good doctor though.