Abdominal distension, nausea, vomiting, what's going on?

Abdominal distension nausea and vomiting is more considered due to indigestion caused, but can not rule out is easy to produce gas food, gastritis, gastric ulcer and other diseases caused. It is recommended to do gastroscopy, if it is caused by gastritis, need to be under the guidance of a doctor with omeprazole and aluminum hydroxide and other drugs.