Acid reflux can get worse with stress and it's quite often caused by candida (which is feuled by sugar). 99% of the time a proboitic pill will completely kill my burning stomach. It's bizarre but 70% of your immune system is related to your gut flora, when you're stressed or not eating well you can effect this negatively which will bring on heart burn, sore tummy and acid reflux. Try it, I had it for YEARS before I knew about probiotics role and whatever you do, don't eat sugar because it's very likely what caused it in the first place.
'Sugar
Our bad diet of white sugar and flour are responsible for our lack of necessary nutrients, and fiber. This makes for a toxic body and bad digestion because of enzyme deficiency. We need lots of enzymes for proper food breakdown. Bad digestion in the stomach and small intestine are major causes of acid reflux.' link
Candida can also cause headaches, tiredness and yeast infections (candida = too much sugar and white flour in the diet). All of those things are something we really DON'T need while we're dealing with stress: link
I hope you feel better soon!!!