Justin,
I'm a little late to this one, but it's so very hard to watch a child and feel that immense inability to help... Wonder if God feels that way at times about many of us...Free Will and all that...
More to the point... please know that my prayers are added to those above for finding a cause and a treatment for whatever
Airway restriction can be from soooo many things...
May you and your wife know that special peace that comes from Him while you wait on medicine to give you some answers...