C Gastroenterologist. If you are like most people, you are using "hiatal hernia" to mean gastroesophageal reflux disease (gerd). Proven rx include dietary changes, avoidance of caffeine, tobacco, and alcohol, wt loss, and acid-lowering meds. If your symptoms are bad at night, putting the head of the bed up on blocks helps, as does eating dinner early. If symptoms persist, it's best to see a GI dr (gastroenterologist).
Avoid spicey foods. Rarely hiatal hernias are treated by surgery. Usually patients are told to avoid foods that cause acid reflux like chocolate, alcohol, coffee, tomato sauce.