No one has ever made me feel horror and despair like Peter Watts. His books stare directly into the abyss. I think it's what makes the hope you feel at the end seem earned.
If you haven't read his work but you spend time thinking about HCI, you should.
He's very proud of having been rejected by a Russian publisher for being "too dark".
I haven't read anything from Peter Watts, but I have read Cormac McCarthy and what you're describing sounds like that.
Have you tried contacting Google for customer service? I’ve found that to be a sure-fire cure for whenever I catch a case of optimism.
I see people differently after reading Blindsight; The picture is much darker, concretely more accurate, with what light is there geared to all hell and so much brighter. I'm better for it and at a greater peace.