I'm no medical doctor or anything, but I've had problems with my ears as well.

It could be just an ear infection, or maybe a wax buildup that hardened and is causing pain. Or it could be a blocked eustachian tube (which you really can't do much about, unless it develops into an ear infection)

I'd go see your doctor ASAP. Hope you feel better soon, ear aches/pain aren't any fun!!