Your husband seems to be suffering from acute respiratory tract
infection and he probably has eosinophilia
. So get a total and differential count of blood and a chest X-ray done.
It may also be due to worm infestation. So go for a stool test
and throat smear too.
Let him do warm saline gargle.
And give an antiallergic and a cough
And please consult your family physician, he will guide you.
Don't you worry.