The method I use has a medical name, but I can't remember it unfortunately (it's actually used for heart palpitations, but I found that it worked just as great

The method I use has a medical name, but I can't remember it unfortunately (it's actually used for heart palpitations, but I found that it worked just as great for hiccups). It's basically lying on your back while holding your breath and applying pressure down on your lungs from both your chest/throat. In my 20's I got a lot of hiccups, usually because I was drinking and talking at the same time; but due to the placebo effect eventually I would only need to lie on my back for 1-3 seconds, pretend to hold my breath and then I could get back up and it'd be cured.