The Middle of A and Z

A pleasant day
Broken
Carved out of
Disgusting noise
Ever
Fallen into the void
Grace is shattered
Hurting feet
Inside the skin
Just like shards of glass
Kill the sunlight
Morning's gone
Never more
Offered
Pieces of life
Quite cracked
'Round the bend
Silent still
Trying to forget
Ugly day this was
Veered way off course
When it was pleasant
X-rays find no cause of what
Yielded such misery and caused A to become
Z, what happened to the middle?