@sillyblone
I'm sorry to hear that your husband is having such a difficult time with coughing due to his paralyzed vocal cord. As I may have mentioned, I also have a paralyzed vocal cord. It is considered, "idiopathic," which means the doctors do not know why or how it became paralyzed.

What do you know about the reason for this condition? Has he been evaluated for surgery to help him with the problem? Here is a link to an article from Cleveland Clinic that describes Thyroplasty, https://my.clevelandclinic.org/health/treatments/22748-thyroplasty.

Has your husband been evaluated for Thyroplasty? While it cannot cure the paralyzed cord, it might help the symptoms. If he has not been evaluated by an otolaryngologist who specializes in this surgery, you might consider seeking a referral.