Reflux is an ongoing malfunction of the acid producing pumps in the stomach. Occasional upset stomach where acid burps up is not reflux.
That's what always gets me when they have those commercials on for Tums and other meds for totally different illnesses.
If this is something new then it would seem to me that it might just be a stomach upset. Perhaps stress, a change in diet, drinking more fluids, etc...could be throwing off the balance in the stomach.
I would tell you to go to Walmart and get a bottle of antacid that is a flavor you can stand then take it a couple of times per day. See what happens. If it calms down then it's just one of those things. Keep some handy in the event it comes back.
BUT if it doesn't clear it up and you're not pregnant then I suggest you make an appointment to see the doc about doing an X-Ray with you drinking the stuff so they can see exactly what is going on when you swallow and what the inside of the tummy looks like.
Too much stomach acid that has not been an issue could be several things. I get more tummy upsets if I am under stress. I also get more tummy upsets if I am not resting well at night. I do sleep in a more upright position so that acid doesn't get in my throat at night. My friend has permanent damage to her lungs and vocal chords from stomach acid coming up in the night time. She can't sing anymore and her lungs are not very healthy anymore. She gets pneumonia several times per year now. She can't even use cleaners at home if she is breathing in strong fumes, like with Pine Sol. She can't use that one especially.
Acid can eat away at your esophagus, it can make ulcers on the stomach surface, it can leave long lasting effects so if an regular antacid has no effect you do need to get a prescription for a stronger acid reducer.