“The Exile,” Edmond Hamilton, 1943 – A man is stranded in an alternate universe, where stories of his real experience are regarded as fantastic and consumed as entertainment. The twist: He’s in this universe, posing as a science fiction writer.
Comments: See the Afterward to The Best of Hamilton. The man being described is based on Henry Kuttner.
Author: Wikipedia: “Edmond Moore Hamilton (October 21, 1904 – February 1, 1977) was an American author of science fiction stories and novels during the mid-twentieth.” “World-wrecker” Hamilton was an extremely prolific writer, particularly of space opera, and appeared frequently in Weird Tales. He was close friends with many prominent genre writers, including Jack Williamson, and was married to Leigh Brackett, a science fiction writer and a screen writer of several notable screenplays.