http://www.youtube.com/watch?feature=player_detailpage&v=h5l4Rt4Ol7M#t=30s when did you start hearing it? I got 18205Hz 0.0
I have graphs showing all the frequencies I can and can't hear, so I actually have more information than you do.
as of 13th june this year: right ear: 250hz: 65dB 500hz: 70dB 1Khz: 90dB 2Khz: 90dB 4Khz: 85dB 6Khz: 85dB 8Khz: NR left ear: 250hz: NR 500hz: NR 1Khz: NR 2Khz: 120dB 4Khz: 115dB 6Khz: NR 8Khz: NR dB values are the quietest volume I can hear at that frequency. For comparison, normal speech is 65-70dB and a rock concert is 120dB. 130dB is the pain threshold. NR means no response, i.e dead. It's a logarithmic scale so an increase of 3dB is actually double the volume. EDIT: these figures are all unaided, i.e without a hearing aid. As of the 28th June, my left would test as NR on all frequencies because I effectively no longer have an ear.
I have a progressive hearing loss, no-one knows why or what caused it. The ossicles (also known as hammer, anvil and stirrup) were surgically removed from my left ear when I was 9 because they were infected, and last month the eardrum was removed and my ear canal was blocked up. I have a cochlear implant on that side now, but it doesn't work yet.