It sounds like you are experiencing evening acid reflux, which is very common and highly manageable. For quick, immediate relief when the acidity hits, you can take an over-the-counter antacid containing calcium carbonate or magnesium hydroxide. To prevent this feeling from occurring, taking an H2 blocker like famotidine about 30 to 60 minutes before your evening meal can be highly effective. Also, try to avoid heavy or spicy dinners, and wait at least two to three hours after eating before lying down. If these symptoms persist for more than two weeks despite these measures, please consult a doctor for a personalized evaluation.