Here's what I hear in the last lines:
"I can see it killing away all my bad parts" || Numbing himself to cover false guilt from past abuse.
"I don't want to listen but it's all too clear" || The emotional pain keeps recurring.
"Hiding backwards inside of me I feel so unafraid" || In a womblike, protected space.
"Annie, hold a little tighter I might just slip away" || Embraced by an empathetic and nurturing woman, but with a lingering threat overshadowing that comfort.
"It won't give up it wants me dead / Goddamn this noise inside my head" || Depression and recurrent suicidal ideation.