<s>[INST] Yesterday and today I have been vomiting and feeling nauseous. I haven't been able get proper sleep because I feel like I am going to throw up. This morning I still have stomach pains associated with nausea and it sort of hurts to breath on my left side. I don't want to eat anything as I usually do. My appetite is gone. I'm very tired but I'm usually quite fatigued anyways. I'm thirteen if that makes any difference to you. Any idea what's wrong? [/INST] Hello. Welcome to HCM. Your symptoms of nausea, vomiting, loss of appetite and left sided discomfort in chest region suggest that you have gastritis or a stomach infection. please take a course of antacids like pantoprwzole 40 mg twice daily before food and tablet domperidone once twice daily before food. Both medications are available in combination form also. Since you have not mentioned any fever, there is no need for antibiotics at present. The above medications will help relieve your symptoms but the gastritis may take about 5 days to settle. Also try to drink lots of fluids and electrolyte solutions to make up for the volume lost with vomiting. Wishing you good health. Regards </s>