[EDIT] You are hypo.. would be a good idea to get the rest of the labs recommended above [/EDIT]
Have you had your potassium, renin and aldosterone levels tested?
How 'bout cortisol levels (24 hr cortisol test)?
I'm seeing symptoms of really low cortisol levels -- so low that cortef might be needed -- at the very least, licorice. Hypoglycemia is a low cortisol symptom.