Often nausea, vomiting, headache and feeling indigestion, what medicine should I take?

Disease analysis: Hello! According to your description, your illness is mostly caused by chronic gastritis. The main symptoms are fullness in the upper abdomen, belching, acid reflux, nausea, heartburn, dull pain, loss of appetite and so on. From the point of view of traditional Chinese medicine, this situation is often considered as damp-heat in the spleen and stomach. Suggestion: I suggest you go to the digestive department of a local regular hospital for a gastroscopy. You can take omeprazole or Chinese patent medicine: Xiangsha Yangwei Pills, eat something digestible, such as pasta and rice porridge, and avoid spicy, greasy, cold and irritating foods. I wish you the best of health!