Mat, thanks for the clarification on the origin of the labs. The reference values and time frames are a bit different than the ZRT standard, but none the less the results speak for themselves. I could prepare a graph on what you based, but it's easy to just see that the trend is staying on the far low end throughout the cycle.
I'm sure you are feeling down and out. You have very little reserves to start your day out with, and the well is basically dry. DHEA is also down, so to me (I could be wrong) this indicates adrenal exhaustion is in a later stage, as this has probably been evident for quite awhile.
Exams ... Yes, a qualified physician will probably want to look deeper into this. I think you need to establish if this is a primary condition (failure at the adrenal level), or if it is a secondary condition (failure in the pituitary). I would imagine tests like ACTH or ACTH Stim would come into play, possibly CRH Stim test, possibly aldosterone & renin + other sub-related tests thereof, and also he/she would more than likely look into some adrenal cortex imaging exams, probably in form of CT or MRI, to cover incidentalomas, cysts, or other image concerns that could be warranted if the root cause is leaning primary.
In essence, this has many of the same similarities of determining a diagnosis to patients with low testosterone, especially the younger ones. There's just other variables and pathways involved when it comes to the adrenals ...
In the meantime, read up on some of Dr. Lam's stuff http://www.drlam.com/index.php, and Canary Club seems to be doing some recent things with Dr. Vicki Latham that's on their site. I haven't got too deep into it, but I'm sure it wouldn't hurt on your end to do some reading as you're seeking some medical professionals.