I am a 50 year old male, who for the last few years, seems to have violent coughing/ gasping for breathe when encountered with: stale air (eg. Closed cars) or strong odor (eg. Car exhaust). I have been tested to be allergic to dust/ dust mites. After a couple of minutes of coughing and spiting out and having a tablet of Benadryl allergy medication, things are pretty normal. The above mentioned reactions happens mostly in morning. I have tried: Zyrtec, Astelin, Flovent discus, among other medicines to no avail. Any suggestions on medicines or potential cures?