"Again, please realise that I am not sure if I have thyroid, estrogen dominance or adrenal issues, although it stands to reason that all of them are likely tied in together."
Dont worry; only a few here have a "proper" diagnosis; yes they are tied together IMO; and no proper tests will ever confirm this fact.
A qualified guess is good enough for me; and the knowledge that Iodine is needed; this is confirmed by doing, experimenting etc. My view on the matter, anyway.