Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that the symptoms of  nausea, weakness, chills, 
diarrhea, headache, unable to eat after eating burgers seems to be most probably due to Food 
poisoning that can occur due to contamination of the food stuff with bacteria, virus, toxins and parasites..
You should 
consult a Gastroenterologist and get evaluated and he can advise you a 
blood test and also stool culture to confirm the cause and treatment can be done accordingly.
As of now you can start taking plenty of fluids or fluid replacement therapy by drinking plenty of oral rehydration solution..
Take Tylenol for pain and headache..
You can take Ondensarton for nausea and 
vomiting and loperaminde for diarrhea..
Take foods like yoghurt, banana, rice in diet..
Take sufficient rest..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.