Plausible Realities, Improbable Dreams
ShortStory 5,503 words Recommended by 2 award/anthology sources
"The multiverse broke last week. Broke is perhaps the wrong word. More accurate would be performed a state-change or found new equilibrium, but tell that to Catalina Chang, who has been popping aspirin like M&Ms ever since last Thursday, 5:54 PM, when the Unspecified Incident in the Lab superimposed all versions of reality together like a flaky scallion pancake."
Quasar links out; the story lives on Lightspeed, where the author gets the click.