I'm curious where you live. Usually dust allergies present when the house is closed up. I live in CT, so my kids start their dust allergies in late October. My DD1 has a dust and cat allergy. I don't know which came first. One October she started the constant runny nose and throat clearing. Doctor had her doing Zyrtec. After about a year, I said "Can we test her so that I know what it I'm dealing with so I can just avoid it if possible?" So they said to go off the Zyrtec for a week. The night before the test, she went to my father's house (2 cats, 1 dog). Her eyes were so red, and she was sneezing non-stop, when I picked her up a couple hours later. I felt HORRIBLE. I had no idea she'd have a cat allergy (even though DH has allergy-induced asthma). So what does she end up with -- horrible cat and dust allergies. So we did all the anti-dust things in her room (roman shades instead of heavy dusty curtains, encased her mattress and pillows, took out all the stuffed animals, etc.) and now she really only needs the Zyrtec if we go to a "cat house" and we avoid it if at all possible because even on the Zyrtec, she gets itchy eyes within a couple horus and starts sneezing if she puts on any clothes that were stored in the house (learned that one the hard way). I've never heard of a dust allergy "turning into" a cat allergy. It's not like they're related. But maybe you could google it. It just seems curious that it started when you got the cat, unless you closed up the house at the same time.
Kathy, mother of 3, wife of 1. My new recipe blog:
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longer searchable by allergen, but at least it doesn't have a virus!)