What Would Cause Me To Have A Sharp Pain In My Right Ear When I Swallow?

A visit to an EENT (Ear,  Eye, Nose, Throat) doctor would get you the right answer.  Sometimes, the pressure when you have sinusitis (inflammed sinus), could cause that to happen.   One way to clear the sinusitis is by using a humidifier with warm air.  But go, see an EENT.
 
Good luck.   I hope this helps.

An infection or blockage of the eustachian tube.

Yep, sure sounds like an ear infection to me too.  I have had plenty of them and seen specialists, but I usually will go in to get an antibiotic to kill the infection and it clears up.