I am a 52 year old male, in very good health, however as a child I had wheezing horribly. I grew out of it. Now, as I age, I am having a more difficult time breathing while exercising. I am in the military at the end of a career but must pass my upcoming Army Physical fitness test. My primary physician once said he thought I had Reactive Asthma. He said this because when I sing loudly or start laughing heartily, the same thing happens, I start coughing and I am out of breath. What are some good medications I could consider?