FM, hope everything is ok, just over a year ago my son went through this, or so we thought.
He woke up 1 night having breathing difficulties, and a fever, we called his pediatrician and he sent us immeadiately to Childrens hosp. in Seattle. They had 2 rookie doctors examine him and they concluded it was RSV, which got my son Nathan admitted to the isolated, RSV room with 5 other infected kids. After 2 days in this room they ran a test on him and realized he didn't have RSV (at least not yet).
It ended up being an adnoidal virus (bad cold) and a "gee were sorry, we didn't actually test him before admitting him, the Dr. just assumed it was RSV. Again please accept our apology", what a bunch of crap, needless to say, we were relieved but also very angry.
My son has some medical problems and this has required us to spend alot of time at Childrens, for the most part they do great work, but this has taught us to question everything, and ask for second and third opinions.
I hope everything turns out well, my wife and I will keep you in our thoughts and prayers.