His symptoms, especially the spinning when turning in bed, sound very much like Benign Paroxysmal Positional Vertigo (BPPV). While he is taking Vertin (betahistine) and his other medications, BPPV often requires a physical repositioning maneuver rather than just medication to resolve.\n\nPlease consult an ENT (Ear, Nose, and Throat) specialist or a neurologist. They can perform a simple, highly effective in-office movement (like the Epley maneuver) to help relieve the spinning. For now, have him rise very slowly from bed, avoid sudden head movements, and stay hydrated.