Plain old dizziness here and there may be coming from an ear.

I get sinus congestion sometimes (especially when the weather gets severe LOW pressures), and I use a Sudafed PE then just once a day in the morning, and it opens up the eustachian tube and allows for excess fluid to drain out. When fluid builds up behind the eardrum, it presses on nerves which cause dizziness.

There is a maneuver to open your ears too. Pinch off your nostrils and gently blow and listen for the clunk of the eustachian tubes opening. (sometimes it is a clear clunk sound and other times a cracking sound). If they don't quickly inflate that is a sign you are congested. Don't do this hard...as you can damage yourself.
But when I get congested my ENT suggested doing this once an hour until they stay more normally open.

http://en.wikipedia.org/wiki/Ear_clearing