I've had asthma since I was a kid.
Take your Meds as a precaution.
You might also be getting a headache due to the flea chemicals.
Or you might be PMS'ing
Or you might be coming down with a cold, and this is just the precursor to it.
That is, if it were me... what I would gauge myself as being.
Knowing me.
In fact I have a headache too, and have been sniffling today too and am irritable.
Little very very slight wheezing. Barely evident. And I am gonna PMS any day now, I think.
But well, I have taken my Asthma meds. Anyway.
I would not use Broncaid.
Those things, are awful. At least to me.
Mucus, may be due to the chemicals and/or off-fuming of the chemicals in your home. Interiors of homes, often accumulate more pollutants, than the outside air.
I would really air out the home, if you can. Chemicals in household air can really get concentrated.
Or use an air filter/air purifier. Too.