The description of the green vomitus sounds like bile, which is secreted by the liver, through the gall bladder
, to break down fats for digestion.
Nausea, stomach pain
, burping, and poor appetite might be gastritis, or inflammation of the stomach lining.
One of the causes of gastritis can be chronic bile reflux.
You may have this, as bile refluxed, or backed up, into your stomach, and then you vomited it.
Gastritis, symptoms and treatment: