Good Morning, Midnight by Jean Rhys

Synopsis from wikipedia:
Sasha Jansen, a middle-aged English woman, has returned to Paris after a long absence. Only able to make the trip because of some money lent to her by a friend, she is financially unstable and haunted by her past, which includes an unhappy marriage and her child's death. She has difficulty taking care of herself; drinking heavily, taking sleeping pills and obsessing over her appearance, she is adrift in the city that she feels connected to despite the great pain it has brought her.