Thank you for the query.
Itchiness can be caused by food allergy
or most probable by jaundice. According to your symptoms it is possible that it was not food poisoning
but HAV infection. This virus infection gets through food and affects liver. Because of liver infection it leads to liver cells destruction and jaundice. So if you have also dark urine and white stool, this is jaundice probably due to HAV infection.
It is advisable for you to have abdominal ultrasound
, full blood tests, liver tests (AST,ALT, GGTP) and pancreas tests, urine analysis, bilirubin
Hope this will help.