How can one be cured of the ailment that befell me after eating the food of a stingy person, based on the saying of the Messenger of Allah, peace and blessings be upon him: "The food of the generous is a cure, and the food of the stingy is a disease"?

The aforementioned Hadith is weak. It is advisable to consult doctors, as every ailment has a cure, alongside utilizing divine remedies such as: frequent supplication, perseverance in prayer, giving charity, drinking Zamzam water and honey, and using black seed.