As far as products, I don't know what to tell you other than Claritan, as that always helps everyone with cat allegies I know.
But, just in general, it seems to help a lot if you vacuum frequently. Lots of cat hair on the furniture and around the house only makes the problem worse. So vacuum a lot, and brush your cat from time to time to pick up a lot of the extra fur before it spreads around the place.
I hope you can figure something out, because having allergies can be quite frustrating. Good luck!