Angel of Death

My neighbor from hell might be the angel of death.  I've got enough keeping me down: depression, OCD, unemployment, massive credit card debt, etc.  But he's pushing me so far and so hard, that he might be just what I need to finally make me kill myself.
I need to sort through this.  I'm obsessed with him and the situation.  He's not worth my, or anyone else's, time, though.  I can't recall if I mentioned this before here.  I try to not repeat myself, I know it's annoying, but I can't be bothered to look back (too far) either.  My next-door neighbors woke me up around 1:00 am Christmas morning.  They were talking loudly in front of my door.  But that wasn't enough.  Then the asshole went out for a cigarette.  The whole time he was outside my windows, he was singing at the top of his lungs.  Wow, did he piss me off!  Then he came into the building: still singing.  I got out of bed, went to my front door, and yelled "Shut up!" as loudly as I could.  I was still very angry, which makes it hard to fall asleep again.  I lied there: cursing him.  When Monday came, I finally called the office about him.  I pretty much only complained about what I thought I could complain about.  I mentioned that he and his wife have conversations in the hallway at 5:00 am that I think they should have in their apt.: because of the time.  The office lady agreed with me.  Then I mentioned what happened Christmas, and that he ruined it.  He did.  I'm used to spending holidays alone, but that made it extra worse.  The office lady was very understanding and said she would talk to them.  
The next day, I saw them.  As I was parking in the lot, I saw them walking to the office.  He looked angry.  They had to go to the office.  It was a close call for me.  If one of them looked back, they could have seen me in my car.  I'm worried they will find out which car is mine, because I obviously don't want it to be vandalized.
Since then, I haven't heard any 5 am hallway conversations.  I also haven't heard him singing at 1 am.  But I've heard him singing.  He forces me to listen to his singing every single day.  I hear it through the walls.  I hear it coming from the hallway through my front door.  It's so annoying.  I definitely feel like I'm being harassed.  I've been thinking about how to deal with it.  I might call the office again, but, since he's not doing it late at night or very early in the morning, I could very well be shit out of luck.  I've also considered yelling through the wall, or the door, at him.  These are some of the things I've considered yelling at him when I hear his shitty singing;
"Stop singing through the wall!"
"Stop singing in the hall!"
"Stop singing through the door!"
"Stop forcing me to listen to your singing!"
"Shut up!"
"Stop harassing me, (their apt number)!"
"Hey hey, ho ho, (their apt #) has got to go!"
"You're evil!  If you don't stop harassing me, you're going to hell (His wife is religious.)!"
"Stop harassing me, or I'll call the police (pretty much a bluff  I doubt they'd do anything.)
Typing them out, they sure seem ridiculous.  But that's the point.  He's driving me crazy.  That's another one ("You're driving me crazy!").  So far, I haven't done any of that.  I'm worried about making the situation worse.  Maybe I'll try calling the office again.
Today, he was singing his head off again.  I left to go for a walk.  I could still hear him when I was outside the building.  Then I realized that he left the building after me.  He also walked in the same direction I did.  I felt like turning around and confronting him.  But I'm so pissed off at him, that a face-to-face confrontation is probably a very bad idea.  I felt better after my walk, as I usually do.  Exercise is great therapy.  It really helps.  But, of course, once I got home, I heard him singing again.  Something's gotta give.