Your symptoms may be due to gastritis/indigestion or excess gas. For now, avoid spicy/oily foods, carbonated drinks and large meals. You may take medicine after meals as needed for bloating.
Please let me know your age, pain location, acidity/heartburn, bowel pattern, and any vomiting or fever so I can guide you further. If pain becomes severe or you develop vomiting, blood/black stools, or marked abdominal swelling, please seek medical attention.
Next Steps
For now, take small meals, avoid spicy/oily food, tea/coffee and carbonated drinks, and walk for 10–15 minutes after meals. You may take simethicone for bloating if needed.
If symptoms do not improve within 2–3 days, or keep recurring, please consult a doctor for examination and further evaluation.