This poem is very deep. I can relate to this and think you have wrote it well... i will give it a 5 because....
1. i think you picked a good strong title
" unheard screams " it stood out but at the same time didnt say what the poem would be about completely.
2. " Pain ripping every nerve
Willing your breath away
Opening your eyes again
Agony's here to stay"
^^ this stanza was amazing to open the poem because it represented the depressed mind, and a lot can relate to that therefor it makes you want to read on.
3. " Sleep the only comfort
Yet so hard to find "
^^^ I liked this line because i am in the cycle that never ends, sleep is an escape to living... but at the same time you can never sleep.... which feeds into the depression. and i think this is what you have expressed through out your whole poem.
4. I liked the flow of the poem and the ryhming, it made it very easy to read and understand. there was no analysing anything.
5. I think you reached out with your emotions to those who also feel the same. Its almost like you have wrote about a daily routine in the day of someone suffering depression. and i think you done a great job.
So, well done from me, I cant think of any suggestions for you.