I'm wondering if the increased coughing is causing pressure on his ear, thus causing the ear pain. He may have fluid building up behind his ear drum as well. I'd have them look at it, because ear pain is horrible, and you don't want a busted ear-drum. They can give you some abx ear drops with an anesthetic in them to numb the inner ear. Let us know what you find out.
Stacey
Stacey