have you had any type of cold or sinus infection or somethign like that? i often get sick & with all the drainage it will make me dizzy like that!...i actually had a spell a couple weeks ago! it's mostly just inner ear like the last person said....but when it happens to me when i have a cold, it just hits me like a brick! i'll be fine one minute then the next i can't focus and my head feels real heavy and the room is just spinning! i feel like mywhole body is just going in circles! the best thing for me to do is just lay down for awhile, and sometimes i feel better....and then normally it'll last all day! i'll also get sick if i try to stand up and walk around when i'm doing it...last time everytime i tried to stand up to leave work and go home...i had to run to the bathroom and throw up! it's not fun....but there's a not a whole lot to do for it, just stay warm get plenty of rest, and ask your doctor for some antibiotics or something! good luck & hope you start feeling better!