Research has shown the cause of hiccups to be eating or drinking too much and too quickly.
Supposedly the stomach distends which irritates the diaphragm.
It has been suggested that to stop the hiccups, eat a spoonful of creamy peanut paste very slowly.
It's worth a try; provided you have a jar of peanut paste at hand.
Caution (mine): not recommended if you are allergic to peanuts.