There are many more choices than 1984 and BNW.
There was that Asimov story about the single human who helped the Androids/Robots achieve freedom by committing Genocide on the whole human race. At the end, he is the only human alive and his supposed girl friend reveals she is an Android.
Then there is John Brunner's "A Jagged Orbit" which was good, but depressing.
Then we can stray into Fantasy with Stephen R. Donaldson and the Thomas Convenant series. I could not get past the second book. It was too depressing.
Then finally, one of my all time favorites that was kind of depressing. "The Siege of Wonder" by Mark S. Geston. It details a war between Science and Magic. You can't help but root for Magic. Science discovers that all of Human behavior, even love, can be modeled by Mathematics. People who fully understand the math, tend to all commit suicide. Science wins the war, but nobody seems to be all that happy about the victory. Very good book, but leaves you depressed at the end.