Kim, if you have low blood and 24-hour urine cortisol then you definitely have an endocrine problem. This is a very dangerous condition and you need to find the cause. You might have Addisons but you also might have a pituitary tumor. Your doctor should be sending you to an endocrinologist ASAP and that doctor should conduct an insulin induced hypoglycemia test to determine what is wrong and how to fix it. You should also consider an MRI to rule out a pituitary brain tumor. I know, because I had such a tumor and it took 5 years before the doctors finally figured it out. They thought I had chronic fatigue, fibromyalgia, lupus and arthritis, but it wasn't any of those.