I once had dizziness every day for 6 weeks straight. If I would lie on the floor flat, the room would move. If I would turn my head, the room would move in a weird way. The dizziness would come out of nowhere and it lasted a few seconds and then go away and come back without warning. I went to my ENT physician who examined me and said my dizziness was caused by crystals that had shifted in my ear. The way he explained it to me was that as we age, sometimes the crystals shift in our ear or ears and it takes a while for the brain to catch up with this shift and thus this is why I was dizzy for a while. A friend of mine had a sudden attack of dizziness at work and the room began to spin and he lost his balance and he had trouble standig up. An ambulance was called and he was taken to the hospital It turned out to be a benign inner ear issue that resolved on its own.