Did I have an asthma attack during track practice today? Was I dehyrated?

If you weren't wheezing, you didn't have an asthma attack. And you also say that once you drank water, you felt a lot better. It was dehydration. Stay hydrated. Congratulations on outgrowing your asthma (yes to the people reading this, you can outgrow your asthma), I'm still stuck with this respiratory curse.