Thank you for your question,
I’m Dr. Saha and I’ll try to help you.
Which food did he take?
he had chicken night before, breakfast bread and ham and that was it
How is his symptom now?
Does he have nausea, vomiting or diarrhea?
he is still feverish but a lil better
he was feeling nausea but did not throw up
Does he have any past illness?
he says he has felt like this before
Does he take any medicine?
How old is he?
he is stubborn, old fashioned time
he took medicine for flu
Fever, tightness of chest indicate an infection in the lungs or chest.
Food poisoning usually cause nausea, vomiting, diarrhea, abdomen pain.
Fever may be there in both the cases.
I would advise to take an examination by doctor.
Doctor can examine the chest & suggest to take tests if necessary.
Flu or viral infection can be there.
Sometimes a bacterial infection can be present & he can need antibiotic for it.
Please feel free to ask, if you have any further query.
you have been a great help