I couldn't hear it at first, then I moved slightly and it hurt my ears!
Strangely, I pass all hearing tests at the doctors, but I have a serious problem hearing people talking when there's background noise. No, not when it's really loud either and I know it doesn't affect everyone because others seem to be able to have conversations around me.
My step-father has the same trouble and he worked in power stations all his life, whilst I worked with helicopters and guns. I suspect that the two are related, but it's odd that it doesn't get picked up on hearing tests???
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