The only time I've had well... no bad side effects was when I passed out for 10 hours or so drunk, no hangover, nothing...
My head had a kind of whine to it the next day though, I felt a bit confused, and as I remember my hearing was slightly affected, but in terms of how I could have felt, I had no aches or pains...
Im jus' saying, from my limited experience, if its badly affected your hearing, I'd get it checked out
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... But it could be due to loud music, loud noises, or something else completely un-alcohol related