 [ Symptoms ] what causes a sudden onset of vertigo while lying down or turning while lying down  within the last two weeks i have begun to experience sudden vertigo while lying down or just turning while lying down if i try to stand up i am completely disoriented i do not understand what is causing this i am not on any medication do not drink or smoke what could be causing this [ Disease ] in the last week i have begun to experience sudden vertigo while lying down if i try to to stand up i become completely disoriented what could be causing this i do take lisinopril 20mg and terazosin 5mg for prostrate do not smoke or drink