What Does Persistent Dizziness Despite Having Lepley Manuver Exercises Indicate?

Have had the Lepley Manuver preformed 4 or 5 times. Given directions for doing it twice a day at home which I do. Still have dizziness most days - some days not so bad but others miserable. Usually start feeling better by afternoon. We are getting an adjustable bed in two weeks. Therapist felt it may help. What else can I do?