It's important to see a qualified doctor to get your asthma diagnosed properly. Treatments vary based on lots of factors, including whether or not your non-exercise lung function is normal.
I thought I had exercise induced asthma for a long time, but when I finally saw a doctor about it, they tested me at rest before and after treatment and determined that my lung function was almost 10% less than it should be. I'm now on a daily treatment and it has made a big difference in my biking, as well as just my life in general.