Well, I'm sure it (the medicine) helped but Donovan was still awake every few hours screaming and crying for mommy. We gave him a couple more breathing treatments through the night and took him to the doctor first thing in the morning. Of course, he seemed to be feeling much better by the time he went to see the doctor.
The doctor seemed to feel that the bug was a virus and there isn't much we can do except to treat the symptoms and wait for his body to take care of itself. The bright side of the story is that he actually wanted to go see the doctor. And he got to bring home a couple of little prizes too!