I was allergy tested twice as an adult and once as a child. Each time my responses to allergens varied wildly. As a child I had severe allergies to cats that put me in the ED several times, once just from being where cats had been but the cats were gone. Last year when my allergist tested me again he said I was having barely any allergy response at all and gave me additional histamine to ensure that my immune system was working somewhere near normal. The human body is a strange thing.

Let us know how it goes.