Asthma in children

My son was diagnosed with asthma when he was 3 months old, since then he has been having problems with excessive mucus to the point where he vomits in excess. I want to help him but the doctors that he is seeing only seem to sedate him. He is in school now and needs some medications that won't make him so tired. We have tried a number of different types of medicine but most of them give him headaches. Are there any medicines on the market that are good to stop the coughing and vomitting?

[National Jewish]

Before your question can be answered it is important to know the nature of your son

[Terry1]

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[totalmuggle]

not to be going off topic but how many pounds is your son?