Apart from Cooksey-Cawthornes' you might consider the following treatment for Benign Paroxysmal Positional Vertigo (BPPV).

http://www.cmaj.ca/cgi/content/full/169/7/681

I researched it to help my father who has had recent episodes of vertigo and nystagmus when turning onto his left side (particularly). I'm not sure if it helping him yet, or even if he is doing the exercises, which involve a whole-body manoeuvre to reposition floating debris that collects in the posterior or lateral semicircular canal of the inner ear.

It might be of interest anyway ........