The purpose is to get the crystals out of the area where they cause dizziness/vertigo and into another part of the inner ear. I was getting dizzy when ever I passed the 10% from horizontal position, going both up and down. In my case I got hit by a car and had to wear a neck brace for over 30 days. With the neck brace I couldn’t lie flat so only experienced dizziness a few times before getting to remove it. A physical therapist was the one that told me what was going on. You can look up positional dizziness and might find something to try as I’m not sure how specific the moves really are.
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