Did she test positive for any allergies? If so, I'm actually surprised that she hasn't had repeated sooner. Allergies can change a lot -- new ones can develop, old ones can go away, and the severity can change.
My daughter was skin tested at age 3, a year later at age 4, and will be again at age 6. I think the frequency depends on the child, and what they are allergic to.
There is a Food Allergies Families board that may be helpful to you while you are eliminating foods.
From the list you posted, I would think eggs would be the hardest to eliminate. You may find help on that board with good substitutes. If anything, I know you can get some support while you are doing the elimination diet.
My daughter had a false negative blood test. She actually experienced anaphylaxis due to tree nuts. A few days later, the blood test was negative. Obviously, it was not correct. The skin prick test was positive. Our allergist did say that there are certain things that can affect test results.
I suggest you see an allergist. He/she will likely want to see the results of the blood test and do a skin prick test.View Thread
It's really scary, isn't it?!! When our daughter was 3, we ended up in the ER after she ate some cashews.
I'm so glad your son is doing OK now. Was he eating something before he reacted?
I think you need to see an allergist. An allergist will help you determine what your son is allergic to, and give you prescriptions for medications to be kept with him at all times in case it happens again.
Reactions can be different each time. Next time may be worse, or it may be better.
Our allergist also explained that kids don't usually react the first time they eat something they are allergic to. It's usually the 2nd time they eat it that you see symptoms. It is also possible to develop an allergy at any age.
There is a Food Allergies Families board here on WebMD that you may find helpful.