I found out today that I'm highly allergic to cats.
Have you ever had a reaction to cats in the past?
There is a cat that upset me a lot of the time, but I never went near it.
It's good to avoid cats from now on if you have an allergy to them.  Luckily, you never had any close interactions with cats in the past, so you should be able to cope with your allergy.
Staying away from should help my allergies for sure.
That's going to be the best first step you can take. If you continue to have reactions I would recommend going to see the doctor