About four months ago I began to experience vertigo/dizziness whenever I turn my head to look up or down. It happens if I am standing, sitting or laying down. I am a 31 year old male and I consider myself to be fairly healthy. I am not over weight and I am not currently taking any medication, drugs or experiencing any other health problems. The symptoms aren't serious but if I am doing a job that requires me to be looking up and down a lot I end up feeling head-achy and nauseous. Do you have any suggestions as to what could be causing this?