hi wimpwannabe, sorry to hear about your dcs
my ds suffers in the same way, he reacts to a viral infection only and doesn't have any other symptoms of asthma
he has been hospitalised many times
with regards to the house, the most obvious being to have non feather pillows and duvets on all the beds, yours included as invariably they will end up with you
another being, to remove as much carpet as you can although, I know this is not always possible
I dress my ds in cotton as much as I can as he can be irritated by synthetic fibers whilst an attack is in progress
and regular cleaning, when he was very little I actually had a cleaner as I wanted to ensure that the house was cleaned irrespective of weather I had the time or not, I preferred having the option of a cleaner to having a take out once a week!
thats all for now, I am sure there will be loads of other suggestions along after me, good luck