I've looked at this question but it doesn't quite match the term I'm seeking.
I once heard a speaker use a term to describe the syndrome accompanied with drug dependencies. He said the word and then asked if anyone knew what it meant. His personal interpretation of the meaning of the word was something like, "...the feeling that the world could fall apart around me and I wouldn't care so long as I have my fix." He went on to give other examples such as, "...I don't care how the bills get paid, I need my (insert drug of choice)."
It's not just emotional, or physical, or psychological... it's all of these. Basically, almost like a catatonic state of being. Also, and I don't know if this helps anyone other than me, if you can imagine Eeyore from Winnie the Pooh saying, "In the long run, we all die. What would be the point of living? Why do anything when it all ends the same way?"
The way this term could be used in a sentence would be,
It's pointless talking to Mark right now, he's fallen victim to/to his ______
Update: Okay, I found this from submissivesuccubus.blogspot.com (don't ask), "When the three of us are together, I feel as if the world could fall apart around me and I wouldn't care at all."
Now this example has a positive connotation to it. I'm looking for the negative.
Okay, one more example before I give into nihilism. If I'm sitting at my house, normal night, watching TV, and then a tow truck pulls up and begins to tow my car. I notice, but don't care or do anything about it. Then the phone rings, I don't answer because I don't care. The power goes out, I don't do anything. I sit in the dark now staring at the wall. An earthquake occurs, I don't move. The house falls apart around me. I still sit in the rubble. I don't care. Bulldozers plow away the debris around me. Winter sets in. WWIII, zombie apocalypse, a black hole swallows the Earth and I don't move, don't care.
I've lost something. Something that makes me pay the power bills, something that makes me get up and hide from zombies... I am/ have become/ have __________ If you tell me that nihilism works for this, than I will concede to it (though it's not the word I was looking for) You all are AWESOME-sauce in my book and I appreciate the efforts.