I've been here before

So many times, I've been here before
Head in my hands, Sitting on the floor
In my mind, as black as the shadow
That exists without light.

So many days, I've seen before
Bang my head on the wall looking for a door
In my mind, as dark as the bottom
Of the ocean at midnight.

So many nights, Like tonight and before
My thoughts at conflict and constant war
In my mind, as unlit as a cave
No one has found before.