The meaning behind "count down"?

[Spartayu]

Hello there. I was just curious about the song, "count down", I've read the lyrics in English, but I do not really understand what Miss Hamasaki tried to convey her feelings in this song.

Anyone knows the actual meaning behind this song?

Spoiler:

In Shangri-la where I had been longing for
The strong and very cold wind
Woke me up
And at the same time, disappeared

I don't laugh nor cry
I experienced despair so much in the past
That I became empty, I feel nothing

I hear some distant sound
You see? The end will begin soon
I'll accept it as it is
On my left side
I need no compassion

"Supposing you are in the abyss
All that is left is to go up"

You said so with no hesitation
It's not important what on earth it meant
There is something more important

* I hear some distant sound
You see? The end will begin soon
Pretend to watch me until the end
I'll be on your left side
I need nothing else

I hear some distant sound
You see? The end will begin soon
I'll accept it as it is
On my left side

* (repeat)