When I was drinking heavily many years ago, I had many of your husband’s symptoms: cough, shortness of breath, wheezing, some chest and back pain, hoarseness. I was convinced it was heart trouble or lung cancer.
My astute doctor listened to my story and gave me a sample of Aciphex, a proton pump inhibitor for acid reflex/GERD.
I told him that I didn’t have any heartburn and he said it didn’t matter to just take it for a week.
Less than a week later all of my symptoms had disappeared.
Some of these PPI/GERD drugs are now over the counter. I’d pick up a weeks supply and let him take it to see what happens.
Sometimes it’s just a simple problem and I hope that is the case for your husband.