Hello,
I have used Nature’s Miracle with good results. It has enzymes that break up the protein of cat dander. I spray it all over my bedroom which seems to be enough for me. I also change my pillow case every other day. I don’t know what it’s like for your husband, but for me, making sure my sleeping environment is as allergy free as possible improves my daytime symptoms in the rest of the house.
Naphcon A eye drops are great for itchy cat dander eyes (in my experience). Good luck.