I have observed many times, vertigo due to Meniere's or Vestibular Migraines usually end up being given a diagnosis of BPPV in hospital. My observation, BPPV is a common by-product of a Meniere's attack, and vestibular migraines. In other words, for whatever reason, on many occasions, a Meniere's attack complete with ear fullness over weeks, hearing loss will release resulting in vertigo, and then pressure relief and being able to hear again - but after the initial episode of vertigo, BPPV remains where certain positions trigger vertigo for a short duration.
The difference is BPPV is results in minor vertigo (* in comparison to that of Meniere's and Vestibular migraines), usually lasting around 30s and has no associated pressure in the ear, hearing loss or is triggered by a certain position of the head, repeatedly.
I can only theorise the release of fluids in the ear as a result of the endolymphatic sac decompression mobilises the calcium deposits in the ear?
Unfortunately, most doctors will simply state the surface diagnosis, and that is, the person suffers from BPPV - a significantly more common issue and is easily treated. Hopefully, one day, researches will understand why vestibular migraines and Meniere's results in BPPV. But for now, if you do end up with BPPV, remember to perform Epley's manoeuvre to provide relief.
