Screaming into Shadows. What does it mean?

Imagine, surrounded by a thick, dark, wet, void--vibrating like an muted all encompassing heart beat: thunk... thunk, the hiss of loneliness pervasive all around you, and this reality is all you know. One moment, you see a glimmer in the distance and upon noticing this you hear at the bottom right of your head-- life. You have never heard a thing like this, and it fascinates you. It naturally becomes your sole obsession, and you spend countless moments looking at that faint star, your only company.

Another moment, your star vanishes, and in that one horrific instance, you understand how dismal your existence was, and now is again. You also understand pain, and heartbreak, both simultaneously, but you know not how to express it. The only word, the only cohesive sound you know, is life. You remember this. Maybe if you imitate this sound, the star will return, you now understand longing. You attempt to utter the sound, but it sounds nothing like what you heard. Endlessly, you try to emit the sound, but after learning what sustained failure is, you start to scream. Cathartic. 

Screaming into shadows! You feel the vibrating of your chest, the straining of your vocal chords-- with every choked utter a tear wells, a new wetness streaming down your face, and you imagine that if you never see your star again, at least you have the power to scream-- scream.