If you Google 'Blood Test Result Interpretation' you will find what your results really mean..one of the particular site I bookmarked (for no apparent preference as there are quite a few online), so I will have a quic reference to....
http://www.alternativehealth.co.nz/cancer/tests/interpret.htm
Low cortisol level doesn't necessary suggest Addison.....although it does make you feel exhausted and weak. But there can be other reasons too. Mine went to close to 0.1 before my first Addison Crisis. Try to get to the bottom of your exhaustion, and try not to get overwhelmed before you have a diagnosis of anything.
Whatever wrong with you is already there, it is more important that you find the answers and get treated. If you have Addison, it will definately worsen your condition by worrying.
If there's anything else I could help with, please do not hesitate to message me. Meanwhile, take care and stay calm.
In freindship,
Kit
You should know that ranges can vary from lab to lab, so take this with some grains of salt:
Did you get your test done fasting in the morning, or did you get it done in the afternoon? If you had it done in the afternoon, I would suggest you request to get it re-done in the morning, as afternoon readings can be low. I don't know that they can normally go as low as yours in the afternoon, but the AM fasting level they care more about might not be as bad.