Zyrtec works for me and you can get that OTC. Someone else on the board suggested it to me when I posted a similar thread awhile back.
I bought a nice air purifier as well and that seems to pull some of the allergens out of the air (you have to look for one that is allergy specific) because I haven’t had nearly as many issues with allergies since I started running the air purifier 24/7. I don’t even take Zyrtec daily anymore, just on an as needed basis and that’s pretty infrequent right now. A decent air purifier/filter is pretty pricey though, and I wouldn’t recommend wasting your money on the smaller ones, I’ve tried a couple of them and they were just junk. If you want, I can dig up the research I did when I was looking for an air purifier and email it to you.
Also, get a hospital / contruction dust mask and wear it when handling hay and cleaning litter boxes. And make sure to wash your hands right after that.
Vacuuming frequently is good as well, but keep in mind that while youre vacuuming, you’re actually stirring up the dust and it will take a couple hours afterwards to settle, so I’d recommend wearing a mask when vacuuming as well.
ETA I just thought of this since you partilarily mentioned your eyes….maybe try a pair of those full sheild goggles they make you wear in chem lab when you’re vacuuming, I would think that would keep a lot of the dust out of your eyes. You may feel like a goof ball when youre cleaning, but hey, if that helps keep you from being so miserable… http://www.amazon.com/dp/B000OVHWHO…B000OVHWHO
Also…. empty your vaccum canister/bag outside to keep from kicking up more dust!