Most cases of food poisoning are not that severe and in most instances people with less severe food poisoning recover from the food poisoning within 2 to 3 days.
It's still a good idea though to go to the doctor to make sure that you have a less severe form of food poisoning because although most food poisoning is not fatal in some cases you can die from food poisoning if the bacteria you're infected with is a deadly form of bacteria.
If the food poisoning lasts longer than 2 days then you really should see a doctor or go to the emergency room to get checked out.