Probably not the time and the place, but have you had a through physical examination with appropriate testing? I'm thinking that whatever cracked your ribs could've hurt your diaphragm, or the tissue or blood vessels surrounding it, which I don't know if could cause persistent hiccups. At any rate, hiccuping for hours with no relief isn't normal, and you might benefit from seeing a doctor. I don't know if they can give you something to make it stop, a muscle relaxant, maybe.

Try forcing a burp after drinking water. Sounds weird, but it works for me....

I would recommend to see a physician

Plug your ears and drink water at the same time. Hiccups will immediately disappear. Works everytime, no joke. Sorry about your ribs.

Stand on your head. Jump up and down. Burp. Drink Ginger Ale. Hold your breath. Get scared. Drink water. Juggle. Yell. Breathe through your mouth. ...and by the time you've read through all of these stupid, inane remedies, you would've forgotten to hiccup. You're welcome.

A spoonful of sugar helps me and also bending forwards and drinking water upside down. That one may be hard with cracked ribs, however.

OP is injured so most these remedies would be painful. I'm not ribbing you he must be hurting. I'm not cracking a joke here because it would be a pain on the side. No. ok ill leave the puns to Pleonasm.

I know that feel.

Goodness... Talk about a horrible combination :(

It hurts because of the cracked ribs. Coughing and sneezing are extremely painful too.