"An Invisible Minus Sign," by Denise Mina, in Deadly Housewives, edited by Christine Matthews, HarperCollins e-books, 2015.
Many of the stories I have read in this collection have been jollyish tales of women trying to kill errant husbands, so this detour to noir stands out for contrast.
Moira is a housewife, sick of making no impression on the world.
She no longer knew if she liked strong cheddar or the boys did, whether France was somewhere she wanted to go on holiday or David's choice. And she didn't even think she liked the hidden Moira enough to send out a search party.
After trying to revive herself with an affair "and a hundred other suburban redemptions," she decides to kill herself.
Of course, she doesn't. Something else happens and I can't tell you what, but it is worth finding out. But the main attraction in this story is the language, as demonstrated above.