Stimulate your phrenic nerve by rubbing your index finger across the roof of your mouth.
Here’s the story of how I know this works. My brother was a quadreplegic, and a doctor was going to use him as a ‘guinea pig’ for a new procedure to help him briethe without his ventlator by placing electrodes in his diaphram. The first test to see if he would be a good candidate was to stimulate his phrenic nerve and see if it was atrophied or not. ( The phrenic nerve begins in the roof of your mouth and goes to the diaphragm.) When they put current to the electrodes, he hiccupped! they knew he was a good candidate so they did the procedure, and he was able to breathe without the ventilator for 45 minutes at a time.
Some years later, I heard that if you rub the roof of your mouth, it would stop hiccups because you are stimulating the phrenic nerve. It made sense to me, so I tried it, and it worked very well.
Here’s how you do it.
Put your index finger on the roof of your mouth, just behind the ridged surface, where you find a smooth spot. Rub that area briskly for a few minutes. Hiccups go away…wha laaa!!