Hi there, I am so sorry to hear about your poor pup. I have a website I frequent when I have a question about an illness in our 'kids'. I hope it helps.
This first link is the info on Vestibular Disease. People post questions to the vet and he answers them. I'm not certain if any will help your situation, but I had to try and help you the best way I could.
The second link is their main website. On the top left corner you'll see Vet info for cats
and Vet info for Dogs
. Those are the pages you go to to see which illness you'd like info on. There's a ton of information on this website. Good luck and I hope your pup feels better very soon.