I get this too. I used to get extremely depressed and lonely just before bed, I think because then you're alone with your thoughts; less able to hide from them through daytime distractions, less energy to fight them because you're tired. I haven't had it to the same extent recently, but I know how it feels.
I'm actually asking to switch to earlier shifts at work for this reason. When I work in the daytime I'm a different person, I have lots of energy and I can sustain a mostly positive/focused attitude all day. At the moment I work until 10pm, and the last few hours are a real struggle. I can feel the depression fall upon me hard, and suddenly I feel lost and tearful and hopeless, and I can't make it go away. It's very scary.
Night time can be difficult.
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Once the feeling hits, I feel painfully empty. Like I'm stuck in a deep hole I can't get out of. Everything I want is out of reach. Love, friends, self-worth. It's like I'm coming to terms with the fact that I'm going to die in that hole, and my life will taper off into a depressing end.
You captured it perfectly.
It's the realisation that one day you'll fall into that feeling, and you'll never get out.