asthma attack

My son never go to school today, he is not feeling well again he has asthma attacked. I already gave him his medicine but still the same. I am always worried every time he has asthma attack; I wish I can help him. Few minutes ago I just gave him his breathing treatment again and he fall asleep. He is very tired of coughing all the time. I hope tomorrow he stops coughing so that he can go to school again.