I walk into a changed world. An eerie silence seems to ring in my ears, but I hear nothing.
The world is quiet now.
The last small poisonous waves crash against an irradiated shore line. I hear a sizzling sound as the acidic water burns the sand to a charred black.
Memories, they're a blur. A fusion of reality and sub conscious creations. I hear voices. They say things...strange things. I hear something like "...geo-magnetic reversal..." and "...the end of all time..." and "...the storm of the cosmos..."
It doesn't make sense.
I climb a cliff with a flat top and stand, looking out. In the center of the ocean, now a dry flat land, is a massive crater. Those voices, I hear them again.
"...the end of all time..."
Civilization is gone now, and I am all that's left. I can't remember my name or where I was born. I don't remember what happened or how it happened or if things were always like this.
In a quiet world, I listen for answers.
It is the voices who answer me. But all I hear is one word, in a raspy, whispering voice: "Tunguska. Tunguska."
Suddenly, the world around me erupts into flames. A blinding light followed by a tremendous explosion have consumed time and space in an exploding void. But as a powerful rush wind destroys everything around me, I remain, rooted to the spot, unharmed by the destruction that could destroy worlds.
"...the end of all time..."
But then the scene melts away in a blur of light and darkness, and an eerie wasteland greets me with a silence. I walk out into the alone, the nothing, the void, and all the while, the voices ring in my head:
It's a bit pessimistic and sad, but it's quite good. My opinion is that you used too many adjectives at the begging and that's a bit oxymoron, cause I think you want to pass an image of simplicity, that there is nothing as you say "I walk out into the alone, the nothing, the void". That's what I think.