For the past few years I've been having very rapid (approx 3-4 thumps per second) thumping in my left ear. This only happens when I'm standing over the sink washing dishes with the water running. The closer I put my head to the water, the stronger the thumps get. It feel like a vacuum effect being created by the water? I have asked 2 doctors about this and neither of them had any experience with anything like this.