Well, since you've gotten no replies and I'm guessing your reflux still exists, I'll take my best shot...
The reflux can come from a few things, mainly being from un-agreeing food or from stress. Un-agreeing food usually includes spicy stuff, as rough as tobasco and as mild as ketchup. I'd start by cutting back on those. If you find it coming at really random times, maybe consider your stress as a factor. I know it's hard; Maybe you consider yourself to be calm in general. But the next few times you get it, think about what was going on beforehand with your life and with what you ate. You might be surprised with the conclusions you draw.
Either way, if it continues, see your doctor (if funding permits) and ask about aciphex. There might be some newer stuff recently, however about 2 years ago, the stuff came out and was an absolute wonderdrug for the population plagued by frequent indigestion.
Best of luck to you. For me, it came and passed, maybe as I matured (around ages 16-18). Maybe you'll see the same thing happen. If not, I really recomend consulting with your doctor. It seems to be a pretty frequent topic to them.
peace
ps- for the time being, I definitely recomend tums or rolaids. For a good while, I never left home without a few rounds of em
