I recommend you this book :Vestibular Rehabilitation, 3rd Edition (Contemporary Perspectives in Rehabilitation) Susan Herdman F.A. Davis Company; (April 3, 2007)


You will be find in this book :evaluation and exercices, including Cawthorne Cooksey exercises but also others exercices for improving postural stability, head and body movements with eye exercises...

The time to see an improvement its going to depend on the kind of vestibular disorder. For instance for a patient with vestibular neuritis, it could take from 3 weeks to 3 or 4 months (on average) to see an improvement in symptoms.