I feel your pain on this one.
My son's asthma has gotten so much better over the years. But, when he was in grade school he was on a few different meds for it and used his rescue inhaler more often than not.
My son came home one afternoon in serious distress. Could not take a breath for the coughing and he had lost the color in his lips. His doctor's office was in the attached medical building to the hospital, so when she heard he was in the ER she came right over.
It took a while but they final got the attack under control but it was scary. Apparently, he HAD gone into the "nurse's" office during the afternoon recess because he needed to use the inhaler and the nurse would not let him. He said it was because she said he didn't need it.
Well, Dr. B was really livid and called the school the next day and conferenced the nurse and the principal to find out their side. This nurse confirmed that she told my son he did not need it because as she said " he was not gasping for air" when he asked for it. Dr B read the riot act at that - told them that someone gasping for air should have an ambulance called not just a rescue inhaler and that they should be grateful that my son pulled through ok.
Within a week after this, all staff and regular volunteers had to go through a special class/seminar on first aid with a special appearance from Dr. B on asthma warning signs and how to handle.
Now, I will say that the nurse and the principal both said that they had no idea that asthma could be fatal. There a many people that think this same thing. I blame some of it on how asthma is portrayed on tv and in movies. It is always the non-athletic or out of shape nerd types that have asthma - they are always immediately gasping for air (never a cough) and it is always fixed with a quick puff of the inhaler.
Jeez - I guess I feel strongly about this, don't I?