Thanks for posting your query.
, light headed and nausea suggest viral gastroenteritis
.Howeverr it can be caused or later superimposed by bacteria.This highly contagious illness spreads through close contact with people who are infected, or through contaminated food or water.
Antibiotics do not work against viral diseases.
Drink extra fluids with and between meals.Avoid fruit juices.
Eat food in small amounts and let your stomach recover.
Get lots of rest.
Check with your doctor before taking medications and you may perform stool test
Hope it helps.