We often develop allergies later in adulthood. I grew up around cats. I am now deadly allergic to them. I too had some type of reaction back in 1984 when I had visited my brother who had a cat and did not know what was happening when my breathing went haywire. Out of his house I was fine. Then a few years later I was babysitting two kittens and guess what, I could not breathe at all. Found out that I had developed asthma (which by the way my brother does too) and cats became my deadly enemy.
My point is, do not take it lightly that you are may now be allergic to cat dander. You have allergic asthma that does not affect you being atheltic. Cat dander sent me to the emergency room almost blue and not breathing at all.
There are many triggers to asthma, and each person's asthma reacts differently to them. Triggers that can bring on asthma are: allergens, irritants such as tobacco smoke or strong odors, changes in weather, viral or sinus infections, exercise, medications, food, emotional anxiety and reflux disease.
If you have doubts that you have asthma, get retested by another doctor to be sure. If you truly have asthma, take you medications faithfully to prevent attacks.
Take care.