"Those with dust allergies...again how did you determine it was that?"
I did have a skin prick test when I lived in Oz many years ago.
When I stick my head in my wardrobe and rummage about, or under my bed, etc, I start sneezing. I've read that it is dust mite droppings, rather than the dust itself that triggers it.
I also start sneezing if I spend more than 10 minutes in a charity shop. That could be dust, or possibly mould spores.
I think that allergies/sensitivities do seem to get worse over time.
I have perfume/chemical sensitivity/allergy - e.g. I sneeze when my cleaner uses viakal spray, but not when she uses Tesco's own brand equivalent.
Plus, certain foods make me sneeze - e.g. anything with mint, & red onions. But I think that is definitely a sensitivity rather than an allergy.
It's all the same symptoms - collectively known as rhinitis.