I have developed sudden dizziness over the past week. It occurs when I bend my head down, lay on my side in bed, or move my head suddenly. The room actually spins, causing nausea and vertigo. The episode subsides quickly when I stand upright or lay flat on my back, but yesterday at 4 am I was awakened by an episode of spinning when I was just laying flat on my back. I have no ear pain or pressure that might indicate an infection.