A normal fasting blood sugar level is <126. Usually in the 100-110 range. 71 is a low number but for most people, however, this shouldn't cause a problem.
However, every person's physiology is different of course. In some people, they do get the symptoms of hypoglycemia in the 70's.
Symptoms of low blood sugar:
- chest pain
- stomach pain
Given the symptoms you are describing, it does sound like you are having low blood sugars and symptoms due to this. I would thus suggest you keep some OJ or candy with you to take when you feel this way.
This may just be your normal physiology but you deserve to be worked up for other reasons that this could occur, such as:- insulinoma
- adrenal disease
- kidney disease
If the above are negative, then you will likely be fine with small frequent meals to keep your blood sugars stable.