This may be a manifestation of reflux of acid from the stomach into the gullet (called gastroesophageal reflux disease in medical terminology). I would advise a four week trial of a more potent acid suppressant than antacids and would recommend Pantoprazole 40 mg once a day. Please maintain a diary of how significant your symptoms of painful swallowing are over this period and let me know. Try to avoid spicy food, too much of tea and coffee and cigarette smoking during this period. This should also help.