Symptoms of gastritis not relieving with over the counter medications need further evaluation. Pay a physical visit for detailed understanding of the condition, clinical examination and if need arises necessary investigations

Your symptoms of burning sensation in the abdomen after eating, along with nausea, may be due to gastritis, acid-related dyspepsia, gastroesophageal reflux, or peptic ulcer disease. However, since you are also experiencing burning in the lower abdomen, other gastrointestinal or urinary causes should be considered. As your symptoms have not improved despite taking medication for five days, I would like to know a few details: 1. How long have you been experiencing these symptoms? 2. Which medications are you currently taking, and at what doses? 3. Is the burning mainly in the upper abdomen, below the chest, or in the lower abdomen? 4. Do you experience vomiting, abdominal bloating, constipation, diarrhoea, or burning during urination? 5. Does the burning occur immediately after eating or a few hours later? 6. Is there any possibility of pregnancy, or have you missed your menstrual period? Meanwhile, I would advise you to: - Eat small, frequent meals rather than large meals. - Avoid spicy, oily, and fatty foods. - Reduce tea, coffee, and carbonated drinks if they aggravate your symptoms. - Avoid lying down immediately after meals. - Avoid taking painkillers such as ibuprofen or diclofenac without medical advice. Since your symptoms are persisting despite medication, I recommend an in-person clinical examination to determine the exact cause. Depending on your symptoms and examination, investigations such as H. pylori testing, urine examination, pregnancy testing, or abdominal ultrasound may be required. If you develop severe abdominal pain, persistent vomiting, blood in vomit, black stools, fainting, or inability to tolerate food or fluids, please seek urgent medical attention.

Burning that isn't easing after five days of medicine needs a proper check by a doctor, not more self-treatment. It could be reflux, gastritis, or something else that needs a different approach.