Vitamin D Deficiency and Adrenal Fatigue – http://www.livestrong.com/article/507179-low-vitamin-d-adrenal-fatigue/
Deficiency of Vitamin D is linked to quite a lot of health issues, as well as Adrenal Fatigue
https://leanmachine.net.au/catalog/articles/vitamin-d3.php (mentions thyroid disease under Autoimmune Conditions if you scroll a long way down)
http://www.grassrootshealth.net (US measurements which are different from UK. You should divide UK result by 2.5 to get the US measurement but there’s a converter if you scroll further down)