For immediate relief from severe hyperacidity, you can take an over-the-counter antacid like Gelusil. For longer-lasting acid suppression, a Proton Pump Inhibitor (PPI) such as Omeprazole (20 mg) taken once daily, 30 minutes before breakfast, is highly effective. Alternatively, H2 blockers like Famotidine can be used. Please avoid trigger foods (spicy, oily, caffeine) and do not lie down immediately after eating. Because your symptoms are severe, it is highly recommended to consult a doctor to rule out ulcers or GERD. Seek urgent care if you experience chest pain or difficulty swallowing.