High ACTH and low cortisol can be Addison's, CAH.
High cortisol is only Cushing's but Cushing's can come from many different sources and that can be difficult to determine. It is not always straightforward.
Of course, a poor doctor is going to tell you it is just stress... but that should not effect testing unless you were stressed during the test. ACTH pulses. Cortisol has different ranges depending on the time of day and should not be elevated all day long and all night long.
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