flavour of the decade.
First they blame it on a virus, then on a migraine. Both wishy washy hand waving rubbish. Unprovable.
Sudden onset migraine condition has to have a very definite reason, and its this they need to settle upon. You don’t walk around without migraine for 20 years plus of your life (in my case > 45) and then start to get a very disturbing and severe 24/7 migraine problem for nothing!!! To get the same feeling of scepticism I had, simply ask a neurologist why you didn’t have migraine for x decades and now apparently you do? You will get either an honest ‘we don’t know’ or some very fanciful answer like ‘a DNA mutation’ which I received. Yes a DNA mutation that only affected one ear, didn’t affect the rest of my body and ignored my obvious ear trauma from 5 months previously. OMG PLEASE DO NOT BELIEVE THIS BS! (it was very hard for me to take this doctor seriously after this statement)
I think I’m pretty convinced its imbalance of fluids in the ear, most likely due to loss of perilymph pressure, either acutely from a big injury, or chronically from a small one that lead to a slow leak or due to a congenital issue. The inner ear’s main weakness is the exposure of the very thin window membranes to the middle ear. This fully explains the risk to me. The nasty part about this hypothesis is that the injury and full onset of symptoms could be separated by months or years. In my case I got ‘MAV’ after ear trauma I had 5 months previously. This can be a subtle imbalance and not affect hearing, just cause vestibular problems. In more difficult cases it can effect hearing too.
We basically need a very accurate clinical test for Hydrops in the ear and then we can put this whole thing to bed.
It speaks volumes that nearly nobody seems to get a diagnosis of Secondary Hydrops (SEH) these days (judging by the health forums), and nearly everyone with chronic dizziness (and without low frequency hearing loss) get’s ‘MAV’. It also speaks volumes that the symptoms and treatment of these two conditions are identical. Then comes the interesting evidence that conservative treatment for perilymph fistula (known to cause SEH) is identical to MAV treatment. It’s also worth noting that MAV is so so so similar to Menieres yet one is about migraines and the other is about Endolymphatic Hydrops - what?! We are asked to believe that the brain migraines are ‘simulating’ all of the ear symptoms that you get in Meniere’s. Just RUBBISH! Ear pressure = migraine? Tinnitus = migraine? Vertigo = migraine? Wake up people, this is totally ridiculous!! The ear pressure is, guess what - EAR PRESSURE. The tinnitus is guess what - inner ear disturbance! And the vertigo is a probably a leak of perilymph, due to … guess what … EAR PRESSURE … and this is probably evolved behaviour because the inner ear windows are clearly very thin to allow breaches when pressure gets too high, probably to limit damage and disturbance to the ear! And don’t get me started on how migraines cause hearing loss! 
MAV, Menieres, PLF, BPPV and SEH are NOT disconnected and separable into categories of ear/brain, they are ALL connected sharing very similar symptoms and due to issues with the very same mechanisms that governs the functioning of the inner ear. Sure the brain gets involved on top, and has to deal with the mess of signals from the ear that no longer matches learned behaviour nor that of the healthy ear - result? MIGRAINE.
It all adds up that MAV = SEH, but somehow an entire influential section of the medical fraternity managed to drown out the rest.
Learn your anatomy and be your own advocate!
/gets down from soap box.