Excessive hiccups?

my 3 mos old (has acid reflux) gets the hiccups all day long. today she had them all day, each time lasting at least 40 mins, with the longest bout lasting 1 hour and 25 mins. she gets them sitting up, in her bouncy, upright against my shoulder (while held belly in and belly out), laying down... I've tried giving her a pacifier, taking a bottle, burping her... nothing works! any tips????? it's starting to disrupt our naps. ugh!