What happens when you're stressed? 

Your adrenal glands go into overdrive and your cortisol levels go up. High levels of cortisol cause the body to scavenge for protein to convert into glucose to provide energy for the brain to deal with the perceived stress (also severely depresses the immune system). So, Adrenaline kicks in. Adrenaline is your fight or flight hormone (also helps to control blood pressure, sweating, etc.) Your adrenals can spike creating a feeling of energy then crash with extreme fatigue when they run out of materials to work with. (Feel fine in the morning, but when contemplating work will get extremely tired. The thought of work can wear them out; any type of stress will cause the adrenal glands to over react (extremely tense nervous) or fail to respond (suddenly/extremely tired).

When cortisol is produced too frequently, it can have negative health consequences such as feelings of fatigue, difficulty maintaining healthy weight, and difficulty maintaining optimal health of cardiovascular systems. When cortisol levels are chronically high, it affects the hypothalamic-pituitary-adrenal axis, basically affecting all your hormones and disrupting the natural feedback loop. This causes the body to be less sensitive to the ‘Stop Signal,’ and creates a vicious cycle of elevated stress signals. This is the root cause of adrenal fatigue. Adrenal fatigue can bring with it negative health consequences such as fatigue, weight gain, and cardiovascular disorders.