I hate going to the ER for my asthma. I am one of the types of people that even in the middle of an acute attack my pulse ox stays high. I had a nurse tell me I needed to calm down becasue obviously I was getting enough oxygen. However, at the time every breath I took ended in a cough. My mother (who is a retired home health nurse) has said that she has seen patients in respiratory failure still have high oxygen levels. These type of things are what discourages some of us not to go.  Another time I went to the ER I was told they were taking non-priority patients first since they could get them in and out faster...