We're really going to need to see your actual results of your adrenal test along with the ranges. Also DHEA if you have it.
If you have low cortisol day and night then you might be suffering from Addison's Disease - it really depends on how low it is though.
If you are a candidate for a diagnosis of Addison's then you need urgent help from, initially, your GP, then an urgent referral to endocrinology. We can't help you with Addison's because it requires lifelong treatment with steroids which must be prescribed. Untreated Addison's Disease can be fatal, so this isn't something to dither about.
However, if your cortisol levels are low but still in range then Addison's Disease is unlikely to be relevant. Doctors will pay little or no attention to cortisol levels which are in range, however low in range they are. In this situation the only possible treatment is self-help.
So, we need to see those results. Some posts you might find helpful, with differing levels of cortisol.
As Human Bean has said that it might be Addison's disease which is where the adrenal glands aren't working well, it can be due to an auto immune condition. Long term steroids can also cause adrenal insufficiency, which is the same as Addison's. You can also have Adrenal insufficiency when there is a problem with your adrenal glands. You need to ask your GP to do an early morning serum cortisol (blood) to see what your cortisol levels are. Sadly many GP's don't have a lot of experience of cortisol issues, so ensure you get copies of your results. Ideally cortisol should be between 350-550nmol/Ls first thing in the morning however the reference range covers the whole day so will be something like 150-550nmol/Ls, but cortisol is high first thing in the morning & then drops through the day. If it is low then you need to be referred to an Endo who has experience in pituitary/adrenal issues - not all of them do.
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