My daughter is Celiac. Very few restaurants are equipped to handle it. It just means you have to cook from scratch more. I make her gluten free bread. We are careful not to cross-contaminate in our kitchen. Over time we have become better and better at handling this problem. Corn is like wheat. It's in EVERYTHING! Don't beat yourself up if you made a mistake and your children get sick. It's part of the learning process, trust me.
I found the book "Gluten Free Girl" very helpful. It helped me to see where I was cross-contaminating - and even though you don't have a gluten allergy, this book is very helpful in helping you think about what you do in in the kitchen, to avoid cross-contamination of corn. An allergen as serious as celiac disease (my daughter gets seizures) or corn allergy worth researching. Since I've been using the principles in this book (the author herself, from Seattle, is celiac) my daughter has enjoyed better health.
When I first found I was allergic to wheat and dairy, I, like you, had to read EVERY label in the store. It's amazing what forms dairy comes in! and wheat! Keep reading. After a while, you get really good at it, and you start to know which brands are good and which are bad for you.
I haven't been able to even send my daughter to camp until this year because of Celiac Disease. Fortunately she isn't as severe as others, which is why we can send her. However, she knows what to avoid, and there are enough items on the menu where she can avoid the offending item.
Food for thought for anyone watching food allergies - GMO products are being outlawed in Europe because they cause the very problems you are describing in your post. I can't eat popcorn without my inflammatory system in my body going haywire with runny nose, joint pains, short of breath, tiredness, and generally feeling lousy. I've narrowed it down - it's not the oil, it's the CORN! I LOVE popcorn, so this is hard for me. ALL corn and soy in this country are Genetically modified, unless there is an Certified Organic Foods stamp on it. (Organic foods are not allowed to be GMO) Studies that have been conducted in labs outside of Monsanto (who has created this awful GMO product) have found that GMO products cause a LOT of problems in the digestive tract and those problems are passed down to the children. I believe that this is what is causing more and more people to have corn allergies.
As parents and consumers we need to let our government know that we don't want our food tampered with. We don't want it irradiated, and we don't want GMO products under any circumstances. All of us need to send a clear message to Washington.
Because of these problems with the food supply in our family we no longer eat corn as a veggie and we no longer eat soy, either. Soy was giving me problems.
God bless you in your endeavors to help your children. This is a very difficult allergy, but the advantage is, that you really take the time to research what your children are eating, and make better decisions in food and nutrition, and all of you will be healthier for it.
My food allergies ( wheat and dairy) and subsequent chronic fatigue really opened my eyes to what we were eating. I'm much pickier than the average parent when it comes to food shopping. My daughter, because I was conscious medically about these things, was diagnosed with Celiac disease by a Naturopathic Doctor at 3 yrs of age. The average time in the regular medical community for finding celiac disease in a person is 10 years!
Keep in mind, food allergies can change. In the past I've been allergic to chocolate and yogurt, and I can now eat both of those things. If all of you were to go off off corn for a year or two, and then only eat non-GMO corn, you may find you are no longer allergic. But you would only want to do that on the advice of a physician or Naturopath.