Hi, Welcome to health care magic, Stomach acidity or burning is a commonest symptom seen nowadays.Your other symptoms like left side chest pain,gas trouble,stomach discomfort etc are also related to this. The causes could be acute gastritis, gastroenteritis,gastric ulcer or Helicobacter pylori infection or food allergy or stress or drug induced. You must undergo routine blood investigations and H.pylori,liver function tests,urinalysis and stool for blood,abdominal ultrasound and upper gastrointestinal endoscopy to detect the underlying cause. Treatment is mainly depend on the cause but you may take symptomatic treatment meanwhile. Antacids like h2 blockers (ranitidine) or proton pump inhibitors (pantoprazole or rabeprazole) will help to reduce excess acid production in stomach. You can also take digene gel or liquid or ulcero-protective agents like sucralfate or bismuth subsallicylate to reduce the burning sensation. Apart from medications you should, 1) eat plain foods like boiled rice and green leafy vegetables without adding spices or oil. It will help to neutrilize digestive acids and also they are easily digestible means there will be no need of extra stomach acid. 2) avoid oily,spicy and fast foods 3) avoid eating full stomach at a time rather have small meals frequently. 4) drink coconut water will help to reduce burning. 5) eat lots of fruits like banana and watermelon. 6) avoid excess tea and coffee. 7) eat or drink buttermilk and yogurt twice daily. 8) chew ginger which releases stomach gases. 9) do morning exercises like walking or jogging which will reduce your stress level. Consult gastroenterologist for detailed medical history and clinical examination to diagnose the cause. Thanks and Regards, Dr.sandipkabra