He could have a build up of ear wax. Will make you real dizzy. I had it. Try olive oil or any other kind drops in ear, get soft and then take it. Easy with the q tip. Ear wax can make one nauseaus too. Makes ya real dizzy and gets worse till you clean out the wax. Take his two fingers, thumb and other finger and rub them together real close to ear and do to both ears. If one ear you can't hear it good it's clogged.