http://aramajapan.com/news/pop-music-emergency-ayumi-hamasakis-non-deaf-ear-is-going-deaf/75372/
After talking about her knee injury recovery, Hamasaki writes:
Just before this year’s tour began I received a second blow – my hearing started to deteriorate further. My semicircular canals had blown, and I was experiencing crippling dizziness. I wasn’t able to walk in a straight line, and was often reduced to vomiting in the restroom at the rehearsal studio. I tried to put a brace face on things, but was told after various hearing tests that my right ear (which had been working overtime to compensate for my deaf left ear) was weakening fast. I don’t have a clear memory of my journey home after that. I just remember wondering how I, as a singer, would cope with two useless ears. Other than that, I was in darkness.