What exactly does the ringing in your ear sound like GS? It happens to me almost every other day and it is my left ear. For me it sounds like a tone, and it's always around the same pitch as well. I would compare it to going to a doctor and getting your ears checked with those audible noises to see how good your hearing is. It's not that loud either, but it's very distinct. It stops after about 5 seconds, and it only happens once. I looked up tinnitus, and that could be it as well.