Amos Moses
WKR
They go in through your sinuses with a rigid balloon that they inflate. Had sinus surgery at the same time so I was under while it happened.That is what I associate mine with, usually have plugged sinus's at the same time that it is most intense, mostly in my left ear, just a high pitch squeal. Yep, too many rock concerts, some were definitely hard on the ears. Firearms all my life, and yes, "plug your ears kids". How the hell do they dilate the Eustachian tubes?