Okay...soo.... having been there...done that... I actually would bypass the ENT... and seek out a vestibular therapist. HERE IS WHY...

an ENT gives you, at best 15 min of his/her time. Vestibular assessment actually takes a lot longer than that.

There is no reason why the neurologist couldn't diagnose you with BPPV... they do it all the time. I wonder why he/she didn't. Perhaps you don't have a positive dix-hallpike....which brings me back to....

a vestibular assessment is more prudent and will give you more answers. if that doesn't work out to give you answers, than you need to see someone who understand post trauma vision syndrome.

*edit* find a therapist near you who is certified (that is important)