I googled about this term, and I learnt from this article below that "excess stomach acid is only found in a few rare conditions like Zollinger-Ellison syndrome".
"In Wright’s 25 years of conducting these tests, he found very few people with excess stomach acid. Excess stomach acid is only found in a few rare conditions like Zollinger-Ellison syndrome), and GERD is hardly ever associated with too much stomach acid."I also learnt that one of the possible causes of stomach pain and/or cramps is skipping meals, as mentioned in this article.
http://www.livestrong.com/However, in Lesley Anne's case, it seems the epigastric pain was probably not due to skipping meals, as she wrote "It doesn't matter if I eat something or not--everyday is the same".
"Nonulcer stomach pain refers to the common symptoms of bloating, belching, nausea and cramping not identified as originating from any specific disease or disorder, according to MayoClinic.com. Skipping meals, leaving the stomach empty except for stomach acid, can create feelings of nausea."
I agree with Dr Kho's advice to Lesley that following up with her personal physician is essential, as his answer is not intended as and does not substitute for medical advice - the information presented is for patient education only.
What Is Zollinger-Ellison Syndrome? What Causes Zollinger-Ellison Syndrome?
Zollinger-Ellison syndrome (Mayo Clinic)
About Zollinger-Ellison Syndrome
Misdiagnosis of Zollinger-Ellison syndrome