It seems like it is referring to the insanity brought on by the lose of a loved one, someone wanted to be released from the pain, trying to find a mental safe haven/asylum to recover from the loneliness (the void formerly filled with the loved one), then having the urge to suicide brought on by mental images of death and self judgement that has enveloped him completely.

some lyrics that support this theory:

Dark forces pull me underground
They never went away completely

How can I feel this empty?
I will not recover this time
This loneliness is killing me

Will I never know peace of mind again?
I don't believe it, I can't achieve it
I think it all is just another sign
It never went away completely

Dreading the final moment
When I have to dream

Dead images are all around again
They're right behind me
They're gonna find me
Judgment from the immortal sin
That had enveloped me completely
I know I'll never know a peaceful night again
Afraid they'll hear me, they don't fear me
Punishment from the immoral crime
The debt was never paid completely

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