Thanks for using Doctor Spring for posting your query.
I have gone through your question in detail and I can understand what you are going through.
Cortisol levels can be checked by blood tests. You will have to give an early morning blood sample. You can get the blood test arranged by meeting your GP. The blood tests need to be ordered officially.
Hope this helps,
In case if you have any further query, do let me know.
Hope this helps you.
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