You may have a severe case of this. I believe that is my case, but my cortisol was low on the ACTH test so the American Dr's pick it up as Addison's disease.
Have you had blood work done, do you know you sodium level?
Make sure to keep eating the salt, if you are craving it , it is a very big sign that you are low. This is the time to stay away from foods high in potassium, until you get checked. Potassium will push the sodium out of the cells. Don't stop eating foods with it in, just not high potassium foods.