Hypoglycemia is the condition in which the body's blood sugar level plummets. An affected individual can feel shaky, dizzy, nauseated, fatigued, or have tunnel vision. Feeling like one is about to faint is a common symptom of low blood sugar. Cortisol, in part, is responsible for helping the liver change its stored sugars into blood sugars to provide energy. In adrenal insufficiency, low levels of cortisol make the liver unable to convert these sugars and blood sugar levels drop. This condition is exacerbated during stress because the body has an increased need to use those stored sugars. Cortisol is normally released during stressful scenarios, and without it, the body is unable to generate energy.