My husband has been diagnosed with Benign Paraxymal Positional Vertigo. In all articles pertaining to this it says usually last a short time and then goes away, maybe to return occasionally. However, this BPPV started in May of 2014 and it has not gone away, the episodes are less severe, but never gone. The doctors have ruled out Labyrinthitis and Meniers disease. Where should I look next? Can it be something else? (He had a brain scan to rule out lesions and such)