My husband has hard coughing

My husband had his hard coughing for approximately 3-4 years now. I am worried for him. Whenever he coughs, he would see spots (in the shape of a smiley face), develop chest pain, cough for up to 5 minutes really hard, may cough up to 6 times a day, has a slight wheezing sound inside, he doesn't smoke a lot, his coughing is really loud, he cannot get mucus up into his mouth for lab samples, sometimes his coughing will make him gag and burp afterwards. Please, what should we do? Even our friends are worried about his coughing!