My ds was dx. w/having asthma when he was 3-4 yo (he is now 6yo). We have done alot of allergy proofing of his room (he has allergy induced asthma due to mold and dust), he is taking an omega 3 oil (fish oil) every night, is on a prescription oral asthma med. called Singulair and we also do chiropractic adjustments.
He has improved SO much. He used to have a chronic cough, would throw up alot of mucus and was sick alot. That has all changed. He can now run w/out coughing and has only one to two acute attacks every year!
You might also want to do a search here for "asthma" and see what you come up with.