Still feeling dizzy after fainting?

I fainted three hours ago, five minutes before closing time at work. I don't remember much apart from feeling really light-headed, almost like vertigo. Everything was spinning, it felt like the ground was spinning, and then my vision went blurry.

I still feel dizzy now. When I stand up to go to the bathroom, the spinning comes back, but then goes as soon as i sit down. I have ate today and drank plenty of water, is it normal to still feel like this three hours later?