wtf?! HAHAHA!!! 
i know what ure talking abt!!! XD
actually its a very normal thing
most people can hear high frequencies emitted from electronic
devices like the television set and other stuff.
but for the case of the sudden high frequency pitches that give u
headaches?
i also get those but they only last for no more than
20seconds....
=) but i think that it can be easily explained using physics!
Sound is made up of waves that can undergo interference
constructively and destructively. so like if the waves fit a
particular frequency, wavelength or happen to interfere
constructively at the position you are in, then it will result in
you hearing a very very high irritating ear piercing pitch at that
position....
so like if you are in an area with alot of electronic devices or
other things that emit high frequency sound waves that are near the
audible frequency range, the chances of a constructive interference
occuring is much higher and you might hear more of those irritating
pitches in those areas... but so far i havent seen a signifcant
increase in such occurances la
>.<
well thats what i have managed to think of so far, coz for me it
seems that even when i move away, the high pitch is still there and
it wont go away until the 20Seconds plus is over...
haha dont worry you wont die from it =)
aiya.. i know i won'tdie from it la.. haha.. but my headache can
last for the whole day 1 leh.. damn irritating.. aiya.. i think i
am jus a little too sensitive to those sounds la.. lol..
