I think this song is about a guy who has kinda screwed over a lot of people in his life, and given them much pain. This guy has gotten so far into madness, and he's just seen what he's done to everyone. Looking back at this, he feels like he's been punched, and he feels remorse, anger, pissed off at himself. He had been "obliterating them" with his life's madness, and he's pissed at himself.
I think this song is about a guy who has kinda screwed over a lot of people in his life, and given them much pain. This guy has gotten so far into madness, and he's just seen what he's done to everyone. Looking back at this, he feels like he's been punched, and he feels remorse, anger, pissed off at himself. He had been "obliterating them" with his life's madness, and he's pissed at himself.