About nine years ago, I had my Cortisol tested and it was wildly high. Doc thought I had Cushings, but then he retested it a few times and it came back normal. I've also had slightly elevated prolactin for a couple of years (no brain tumor though )
You know, Cushing's can be a difficult diagnosis to make, and I've read more than a few stories of women who went years without being properly diagnosed because their doctors didn't do the right tests. More detailed testing than just measuring morning cortisol levels can be required: http://endocrine.niddk.nih.gov/pubs/cushings/cushings.htm You might want to make sure they re-evaluate you for this if the right kind of testing wasn't done in the past.
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Can you think of anything else that would cause the pulsating pupils?
The pulsating pupils is a sign of fatigue in the small muscles in the eye. I would imagine anything that causes great fatigue could cause this to happen, including sleep deprivation. It is not unique to adrenal fatigue, despite the claims of its' proponents.