Hello and thanks for the query
Along with the medication you are using, give your husband steam inhalation with chest physiotherapy
and after every steam and nebuliser try to expel out the phlegm as much as you can.
During the episode of shortness of breath
you can use inhaler pumps which will give relief in few minutes.
Along with the medications protect your husband from unhygienic environment, keep him in a well ventilated area so that their is no shortage of oxygen
. Don't give him cold
water, cold drinks, ice cream, fried and oily food and banana.
Hope this will help you.