The Eustachian tube connects the throat and the middle ear (the site of a typical  ear infection ) and allows air to travel between them and equalize the pressures. When the Eustachian tube is temporarily pinched off, pressure can build up in the middle ear.
Visitation is a matter of state law, but generally speaking, every state allows parents to exercise a reasonable amount of visitation with their children, which generally means enough time to establish and maintain a meaningful relationship.
After-death visitations are visions of deceased loved one(s) by people who are not near death. DBVs usually occur when someone is very close to death and they see visions of deceased loved ones who greet them to help the dying make the transition of death.