Helicopter noise in my ear I’ve never heard before.

I was lying down on my left side when all of a sudden my left ear was throbbed like there was a tiny helicopter inside. Freaked me the hell out. Never had this happen before. Ot lasted for 45 seconds but I wasn’t listening to anything. The only thing I can think of was that I’ve had my jaw lock before so I’m wondering the way I was lying down effected it.

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