A case of food poisoning while working for self-professed genius and multimillionaire Henry Silverman turned an Upper West Side nanny’s career toxic, court papers claim. Donna Dillon says she’d been working for Silverman and his wife, Karen, for five months when she had some bad fish courtesy of their personal chef, The Post’s Dareh Gregorian reports. Dillon, who’d been taking care of the couple’s 2-year-old in their Central Park West mansion, got a note from her doctor saying she needed three to five days to recuperate from “gastroenteritis,” the papers say. Then on March 23, the Silvermans’ security sent her a text saying the “family doesn’t need you anymore.” Her suit claims she was canned for her stomach issues, which was “discrimination” against a “disability.” She says she’s had problems finding work since, because Karen — a much-younger ex-yoga instructor whom Silverman married earlier this year after a protracted divorce from his wife of 30 years — bad-mouthed her to potential employers, telling at least one she’s a “crook,” the suit says. A rep for the Silvermans said they had not yet seen the suit, but that they “acted at all times fairly and appropriately with this individual, and there’s no merit to her complaint.”