Multiple occurrences over the last five years or more. PCP sent me to Phy Ther specialist for Vertigo. Put goggles over my eyes, laying on large flat table moved me in multiple positions. The googles were connected to a PC. They were watching the insides of my eyes and how they reacted to the movements. Identified the cause and allowed them to perform the Epley Maneuver immediately. They instructed me not to do the maneuver myself as I could move the crystals further into the canal and make things worse. Got better over the next couple of days. I was a site on the golf course. Fell down multiple times after picking my ball out of the cup. Many have told me they do the maneuver themselves after watching YouTube. I have insurance so I would just go back to a professional if I needed it done again. Hope it helps.