Here's an advice for those having asthma, take honey and try out some traditional chinese medicine. In the meantime, try to drink soup that warms your body such as mutton soup.
I used to be an asthma patient, I do not wish to see people suffer while I am cured.
By the way, take lots of fruits and water. I drink up to 13 cups of water a day, my friends call me water tank.
Cheers, have a healthy life