He does also suffer from hayfever, but this reaction he has been having is quite extreme, and only comes on at night...
He has had a reaction to cats before, staying at his brothers house who has 2 cats that slept in the bed we were due to sleep in, but we put this down to the state of their house as well as the long hair cats being in close proximety.

He's on hayfever tablets, and with any luck the doctor might beable to suggest something tonight..