My mother has had a chronic cough over 15 years, seen many doctors and specialist and still can t find a diagnosis. She can t smell any deodorants, perfumes, air conditioning, heaters, spices, any type of odor gives her a cough attack to where she vomits or pees herself. She doesn t smoke or drink. She has been prescribed from allergies Meds to tusinex and promethazine but after a couple of weeks she becomes immune to it and has no effects anymore. Please help! Her heart has enlarged from all the coughing, it s hell watching my mother with this never ending cough.