Help

[billy]

i'd suggest removing words that don't add anything, i've shown one instance, there are more. i'd also second what anon said and exchange some of the line by using stronger images. cliche often weakens a poem. for me, the repetition of ideas and phrases doesn't work.

Heavy drawn curtains blanket the window pretty strong first line.
darkness, darkness, cold, alone a suggestion would be to put [alone] on it own line to create some kind of visual within the poem
hide behind the blankets [blanket] has been used a suggest would be to use something like [drape the window] or another word in the first line.
clutch your pillow, cover your face
Help me, help me
You scream, yet you hear nothing but silence you scream or I scream?  is [yet you hear] needed?
Falling, lonesome, down the harrowing abyss
Does no one hear me? Will no one help me?
 
Help me to step out from the dark,
to feel the sun shine on my face,
to feel its warmth in my heart.
Help me step out of this shadow of memory,
out from the cold, abysmal yearning of my soul
and become safe again. 
and become whole again.