@lisalucier I completely agree with @lluth412 - even my pulmonologist/ allergist says not all allergy tests/testers/serums are equal. In my case, I can often handle one allergen at a time, but 2 or more send me into a tailspin. For example, I can be around my daughter's dog or her guinea pigs, but not both, ans and absolutely not in her home where both live.
Yesterday we toured a bunch of old homes, most of which surely had mold. I did fine at first, but after about 2 hours my system overloaded into an asthma attackinhaler to the rescue. 5 years ago, I would not have tolerated even one of those houses.
So my non-professional observation is that allergies surely do change over time.