Acute vertigo which occurs in supine position may be due to Benign paroxysmal positional vertigo . Characteristically it occurs in one particular position , last for few seconds and associated with severe vertigo or nauseating feeling. According to me you need to visit a neurologist who will do Dix-Hallpike test and if required will do an Epley s maneuver . For treatment Brandt-Doroff exercises and some medications may be given. In some patients it recovers by its own. Praying for your early recovery.