While traveling by air the ears can become clogged especially during landing. No medicine is needed for this. Only close your nose with your two fingers at the beginnings of nostrils and push a blow by closed mouth. This will be open. Of the eras are clogged due to cold and flu, then use antibiotics to treat this.
Usually it should go away on its own. It also helps if you use a nose spray for allergies because the clogging in your ears is from fluid buliding up due to some sinus stuff. But, it should go away after a week
Hit alt-f4. That should do the trick