A more recent book worth checking out regarding modern pessimism is Szymczyk's Atlantis & Its Fate In The Postdiluvian World, slightly philosophical and extremely pessimistic at times, bordering on science-fiction at others, but overall a highly entertaining read with some interesting comparisons of Kodiak Island around 10,000 BC with descriptions of Atlantis in Plato's Timaeus and Critias. He also mentions Schopenhauer quite a few times, which is why I'm mentioning it (disclaimer: I know the author and have been championing this book so I might be a bit biased, however, the book is free on Kindle right now so this is not a commercial endorsement).