Frequently dizzy?

Hello. I've been feeling dizzy frequently. Several times a week at least. It occurs regardless of motion and doesn't go away after laying down/ closing my eyes. It feeld like I am motion sick, and the spells last for a few minutes to a few hours, and once for over a day. I am not dehydrated or anemic, and I am otherwise in good health. What could be the problem here? Dramamine makes the nausea go away, as does antihistamines which leads me to think it is an inner ear problem, but it always comes back. Anybody else have this problem? Any suggesions?