What Causes Dizziness?

Discussing the causes of dizziness and vertigo.

[codenamearun]

Please answer me.How to distinguish between pppd and vestibular migrain in simple way, iam diagonsed with vestibular migrain 2 weeks ago. My symptoms started around 1 and half month ago.I done full body checkup including 3t mri of brain, echo cardiogram, ecg, blood tests, urine tests, abdominal scans, chest x-rays etc, every tests were normal.I also done tympanogram audio test, again that was normal.After watching several videos in youtube iam confused whether iam having pppd or vm.The symptoms I have is constant balance issue like floating feeling, sometimes head ache, constant tinnitus in my left ear and had episodes of dizziness before taking medication.My symptoms suddenly go away when I lay down in bed except tinnitus.The things that make my symptoms worse is driving, skipping meals or bad night sleep.first 4 weeks I had very high anxiety, now anxiety under control after full body checkup, diagonsis and medication.In 1st week of onset of symptoms I had problem in focussing my eyes and also found nystagmus when I turn my head or eyes to left side, but then after 3 weeks of onset of symptoms my eye nystagmus gone and eyes started to focus correctly.I had 5 or more episodes of dizziness in last month accompanying with slight irritation to sound when iam with crowd. Now iam taking migrain preventive medication beta blocker, now after taking medication iam not having any dizzy episodes with sound irritation but still have balance issue while standing or walking, but not a huge one just a floating feeling.Dr please answer my query.

[harizpoljakovic]

20:10 what would happen if both vestibular nerves were transected? How would the patient feel?