Adopting Japanese life style elements

[Little lunch]

Food poisoning takes hours to kick in. Sometimes weeks.
If it was food poisoning, it wasn't the food you ate at the restaurant.
Incidentally, if you'd eaten at a Japanese restaurant, where a lot of the food is served raw and involves seafood, your chances for getting food poisoning would not necessarily be less.
Most food poisoning occurs from the victim's own homes.
My biggest tips would be to use sanitiser on food surfaces, bleach cutting boards often and only use wooden ones for bread, store food items in the fridge covered and dated, never store cooked meat under raw meat, never use the same cutting board for cooked meat that was used for the same meat before it was cooked (or the same knife), never allow mould to grow in your fridge, make sure to throw away food items that are past their used by date, only ever reheat cooked food once, don't let hot food drop below around 65 degrees and store at under 5 degrees.
Cooked food between these temperatures will grow bacteria exponentially allowing greater chance for food poisoning.

16 years ago I went to cooking school. Food poisoning, if it's going to happen, will occur within 8-10 hours after digesting the offensive meal. By 18 hours, what you ate, is out of your system, though the effects may not be. Food does not stay in the gut for weeks. Your body breaks it down using acids and the good bacteria in your gut, takes what it needs, nutrionally, then the rest is moved through the intestines and turns into waste.
If what you ate a week ago is still in your belly, that's not a good sign.

Diseases like Listeria and Mad Cow Disease are caused by bacterial infections through food poisoning.
Incubation rates can be years.