Heavy oily meals, overeating, spicy foods, and carbonated drinks can sometimes irritate the stomach lining and increase acid production, leading to heartburn, bloating, early fullness, and discomfort after eating. In many cases, this settles gradually with proper food habits and avoiding triggers for a few days. Nexpro is commonly used to reduce stomach acid, but headaches can occur in some people as a side effect, though dehydration, acidity itself, poor sleep, or irregular eating may also contribute. Instead of taking large meals, try eating smaller and lighter meals for a few days, avoid tea, coffee, spicy foods, fried items, soft drinks, and lying down immediately after eating. Drinking enough water and keeping dinner light may also help. If the headache is mild and temporary, it may improve, but if it becomes severe, persistent, or starts only after the medicine, it is better to speak with your doctor about whether the treatment needs adjustment. Seek medical attention sooner if you develop vomiting, black stools, severe stomach pain, chest pain, difficulty swallowing, or continuous loss of appetite.