Hello Jennifer!!
Welcome to WTM, and it's always, always nice to have some others to bounce ideas with on the endocrine system.
I am 34 weeks preggars and beginning to feel my dilation start up (I delivered #9 at 36.5 weeks, so I'm not too early or anything).
I think yours is a Very Good Question. I haven't researched online, though.

I began adrenal fatigue (NOT to Addisons, yikes for you!!) probably around pregnancy #7, when I began experiencing many of the more severe symptoms. I haven't been able to go into labor without help since #5, with the exception of #6 boy who broke my water and was born inadvertantly on the living room floor. Lol, our first homebirth, which took about 45 minutes, 1-2 contractions, and really no pain in pushing.

With #9, seriously, I was dilated to 4 cm, almost 100 percent effaced, and no contractions. So, after a wee bit of research on the internet about endocrine system, I figure maybe it goes like this: since I know my adrenals blow out sometimes, then I should at least wonder if the other endocrine system glands are not balanced either. The pituitary (along with others, but that's the primary) is supposed to put us in labor.
So,

I am hoping to find more books on complete endocrine system nourishment. I went to my pharmacy where there are natural pharmacists there (trained in more natural remedies) earlier in this pregnancy. She did not recommend that I specifically nourish the pituitary in the hopes of going into labor because she didn't think it a good idea to possibly further mess with an endocrine system already growing a baby.
I do not believe I have read in Dr. Wilson's book that the adrenal glands are connected to labor, but do you remember anything in there about it? So, I wouldn't know on that one other than your endocrine system, while able to do the horomone things it's supposed to right now, may have too much on it's plate as a whole.

Just a possibility to me, at this point.
I'm preggars with a boy this #10 time. Boys are the only ones who break my water, and so I am thinking if my water breaks, I go into quick labor. See, #9 was induced and a girl. My doctor broke my water and the same thing happened with her--they were all a little surpised to see the head about an hour later.

I literally ache all over, but don't have contractions any other way.
I am thinking about trying the endocrine system supplement suggested earlier on this thread (Master Gland) after this pregnancy. Perhaps with time and diligence to nourish the adrenals, the entire endocrine, and do as you are doing as far as following Dr. Wilson's book, maybe if I get to go to #11 I will actually, shock of all shocks, go into labor.
I hope you go into labor soon, and that your delivery is everything you hope for,
Let us know!!
Blessings,
Cara