My son Pat is 21 and going to college part time. This summer he started to have respiratory issues requiring use of his bi-pap during the day. Though the need for the bi-pap is part of the progression, allergy/asthma issues seem to be a large part of it. He has had post-nasal drip all summer long and any irritant, such as neighbors mowing their lawn or windy dry days just send him into a cough. I am using albuterol with a nebulizer, over the counter antihistamines and relying on my cough assist. Wondering if anyone has gone through this, has tried allergy testing or the Singulair products. This allergy/asthma thing is new for us.