HI, thanks for using healthcare magic
A hiatus hernia
occurs when a portion of the stomach protrudes through the diaphragm.
By itself it does not usually cause symptoms but predisposes a person to reflux or worsens reflux in some persons.
In terms of food,you should use a diet that would be used for persons with reflux.
This means reducing the use of spicy/fatty/fried/acidic foods , using small meals.
I hope this helps