I am not a specialist per say in BPPV, but I have had vertigo since 2006 so have had a very personal education about the topic and its various causes....including BPPV (which I do not have, unfortunately). One of the foremost vertigo specialists in the world is Dr. Timothy Hain, of the Dizziness and Balance center in Chicago, USA.
He has an article on anterior BPPV and its treatment, explaining the pathology of it, and which has many different exercises to try for treatment Anterior BPPV is a rare form of BPPV and not as much studied as conventional BPPV. I include the link for you here as the article is way too long and too detailed to summarize adequately: http://www.dizziness-and-balance.com/disorders/bppv/acbppv/anteriorbppv.htm
I hope you and your treating ENT can make good use of the information in the article. I wrote to Dr. Hain regarding my own case and he was kind enough to send me a polite reply; if you needed to consult with him on yours I do not doubt (but cant promise) he would answer your email as well. His contact information is here: http://dizzy-doctor.com/cv_hain.php
I hope that helps, and I truly hope you feel better soon...I know just how awful vertigo is.
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