Ive got 5 cats, had them for a while now 3yr or so, but ive also grew up with dogs and cats all my life and been fine

. But my friend has a rottwiler and we noticed when im around him i start sneezing, then get swollen eyes. eyes itching / watering, with blocked/runny nose then my throat feels on fire. Only happens when im around my friends rottwiler. Anyway now all they symptoms i get with that breed i now get when im in the house with my 5 cats. We dont allow them in most of the rooms so there is hair free rooms but even in the rooms i get all the symptoms^^. Im basically living off piriton. This only started happening a few months back. Can this randomly just happen??