Avoid gassy drinks. Losing weight nearly always cures it. Eating small meals each day instead of 2 or 3 large ones helps. You must have a light evening meal without alcohol and avoid supper so that your stomach is empty on retiring. It takes about 1 hour for the stomach to empty.
Smoking certainly aggravates it, as do coffee and alcohol, especially spirits.
If symptoms occur at night, you are advised to use extra pillows to prop up you head and shoulders. The key to coping with a hiatus hernia is to keep at ideal weight.