it's very frustrating. I found the best way to take control was start reading and learning. the main thing I took away from this whole experience was to take responsibility for my own health. at this stage, I can barely remember my doctor saying 'I can't answer your questions any more. at this stage you are more the ms specialist than I am'.
if it's any comfort there is actually plenty you can do to try to optimize health right away. gives you something concrete to act on while you wait for the medical machine to lumber it's way through the process.
for starters vertigo has been linked in research to deficits in various nutrients including vitamin b12, magnesium, ferritin, and zinc. have your docs tested you for all these things? if so do you have the results? have the docs nailed down whether your vertigo is peripheral or central?
a study on causes of vertigo (from a neurology journal so not drilling down to the nutrition level):
Central Vertigo and Dizziness: Epidemiology, Differential Diagnosis, and Common Causeshttp://journals.lww.com/theneurologist/ ... gy,.3.aspx
The most common causes of dizziness are peripheral vestibular disorders, but central nervous system disorders must be excluded. ... central causes are responsible for almost one-fourth of the dizziness experience by patients. ... The most common central causes of dizziness and vertigo are cerebrovascular disorders related to the vertebrobasilar circulation, migraine, multiple sclerosis, tumors of the posterior fossa, neurodegenerative disorders, some drugs, and psychiatric disorders.