sankofa

Question: I'm looking for screenplays in the vein of Roman Polanski's Repulsion: relatively contained, psychological horror/thrillers with small casts. Also any movies you can suggest similar to Repulsion? Psycho and Black Swan came to mind though they aren't exactly like Repulsion they do exist in a similar plane (main character struggling to maintain their sense of sanity/losing their sanity, etc. Thanks!