i used to be TERRIBLY allergic to cats my whole life until i finally got one of my own - not caring about the consequences. i have ALWAYS adored cats and no matter what, i was determined to give one a home. well it took me almost a full year with my first cat before i developed what is apparently a sort-of tolerance to them. it has to do with their dander, i believe. for a year, i was miserable around my cat, but absolutely ecstatic about finally having one... after than, it seemed that my symptoms dissipated (my doctor had advised i get rid of the cat altogether but i said NO WAY)... now i have 2 cats and we're all great! no bothersome allergies (not to the cats, anyway!)... i brush them often and bathe them about once a month to reduce the dander. there are also these kitty "baby wipes" type things that help and are easier than bathing them (which they sort-of got used to). when i go to other people's homes where there are more than one cat, though, strangely enough my allergies are set off again, but i'm sure it's because of the precautions I take at home. i also vacuum as often as i can and use one of those sticky rollers to pick up as much loose fur as i can.
we are all living happily now and i only have to battle my seasonal allergies now!
good luck with yours - hang in there - in my opinion, it's SO worth it!