Hi, thanks for the query. Yes it might be some food poisoning
. There is diarroea , nausea
( burped) . Mild degree shivering and mild degree usually associated with food poisoning. Sulphur type taste is another feayres in this case. Now only way is to drink sterile water maximum as far as possible. If you feel lethargic than consult a doc, until you can use ORS
. More and more fluid is another way. Good luck you will recover within a short period.