I’m an ER nurse and have seen quite a few people come in with intractable hiccups.
Have you ever had these episodes before?
Do the hiccups prevent you from sleeping?
If not, do they start up again once you wake up?
Here’s what I would suggest. If they have been persistent for this long, you might want to get checked out. First, you can try to place a tablespoon of sugar near the base of your tongue and let it dissolve. It’s a home remedy that has something to do with stimulation of the soft palate.
If they continue, I would call your family doctor and let him know what’s going on. You may need to go in for an ear exam as foreign bodies against the tympanic membrane can cause hiccups. He may or may not do a chest x ray and some simple blood work.
Usually what works is Thorazine 25-50 mg three to four times a day for 2-3 days.
Hope this helps.