EHO here.
As you’d expect, we get calls about this all the time. People often assume it’s the last place they ate out that caused the illness. But most food poisoning is caused in the home.
The Chinese could be the cause. The usual suspects are bacillus cereus (from the rice) or salmonella/campylobacter (most likely cross contamination from chicken/eggs rather than being under cooked).
This time of year it could also be viral (Norovirus/winter vomiting virus), which has a quick onset period and is highly contagious eg you can contract it from door handles.
Suggest you contact your local environmental health department to see if they’re interested (cut backs due to austerity might mean they’re not). I should point out it’s very difficult to prove the source of food poisoning unless you have an outbreak.
Finally, what is the Hygiene Rating of the business? Always worth checking!
http://ratings.food.gov.uk/
Is that enough info, or should I get my coat??? 🙂