Determining the "best" short story related to stress and tension is subjective, as different readers may have varying preferences. However, I can recommend a classic short story that effectively explores stress and tension:
Title: "The Tell-Tale Heart" Author: Edgar Allan Poe Published: 1843
"The Tell-Tale Heart" is a psychological thriller that delves into the mind of an unnamed narrator who insists on their sanity while describing the meticulous planning and execution of a murder. The story builds a sense of increasing tension as the narrator becomes increasingly obsessed with the idea that they can hear the beating of the victim's heart, even after their death. This mounting anxiety and guilt lead to a gripping climax that showcases the impact of intense stress on the human psyche.
The story is a masterful example of Edgar Allan Poe's ability to create an atmosphere of dread and psychological turmoil. It vividly illustrates the effects of stress and its ability to drive someone to the brink of madness.
As with any work by Edgar Allan Poe, "The Tell-Tale Heart" might be a dark and intense read, but it remains a classic in the realm of short stories that explore the themes of stress, tension, guilt, and the human psyche.