I wasn't aware that you could be diagnosed hypoglycemic by hair analysis, but if you never have checked your blood Sugar with a glucose monitor, I urge that you do, even if just to confirm what you got.
The Target brand glucose meter and test strips will run you less than $30. A small price to pay for confirmation.
If you ate a vegetarian diet for a week, would you get these hypoglycemic symptoms back?
You saying "Now the hypoglycemia is gone as long as I stay on a lowish carb diet" led me to believe you might not got what you think.