I had these types of reactions, mostly the breaking out, since I was an infant.
Stress can aggravate allergic responses, that is true, so mental attitude can play a role in the severity of the reaction.
However, the problem is, I will be going along, happily eating something that has hitherto been safe, and within a couple weeks, I am clearly reacting to it and it goes on the don not eat list.
Dear Metmom, you have my most sincere prayers. As a life long allergic I can begin to understand your problem. I have NEVER been to the point that you are and have been tested but never to the extent that you have been.
I remember something my allergist said when I continued to wake up at 3 am with a screaming migraine. Allergy tests said I was barely sensitive to a certain food but after it was digested I was more allergic. They could not test for the affect it had on me after it was digested.
That is when I had to stop eating chocolate and corn because those were the offending foods. Other foods that I showed a slight allergy to could be eaten without consequence, such as beef and eggs.
Allergies are a strange and terrible problem and my prayers are with you in your quest to regain your health.