Ok... let me explain the effects of low cortisol, normally. What is is simply is that your body cannot manage sodium. In most people, when sodium goes down, potassium rises - you get confusion, nausea, headaches, vomiting, low blood pressure, chills, sweats, fevers, and it all can lead to coma and death. Look up adrenal crisis for other symptoms.
Now, in some people with adrenal issues, potassium does not rise.