Since August we have been struggling with a terrible cough, practically nothing passes or is it possible?

Hello son is 3 years old. Since August, we have been struggling with a terrible cough (day night) and shortness of breath at night. We go to a pulmonologist (when he has an intensified cough you can hear swisty) and for about 1 month the son has an inhalation of comboterol 25 UG + 125 UG (previously I did him from August day in and day out of inhalations from nebudu and with more cough and shortness of breath from berodual) Practically nothing passes or is it possible? Did he just not get the right inhalation for his asthma..? Please hint