IMO,

This is the best test to take. It will prove that you are severely Iodine deficient, as are >75% of those tested.
Also take the Fluoride & Bromide tests:
http://www.hakalalabs.com/testing.html

The prostate requires iodine. See Prostate testimonials here:
http://tinyurl.com/iodine-testimonials
My own prostate problems & libido were cured with iodine. You will read in testimonial just how terrible our prostate can become without iodine.

Libido is also dependent on iodine. Testosterone is made in the testicles, and the testicles require Iodine to generate its hormones. Ditto female hormones require iodine. Women suffer the most from Iodine deficiency diseases which in most cases are the same as Candida Symptoms.

Brain Fog & Depression are also iodine deficiency symptoms:
https://sites.google.com/site/iodinereferenes/home

Read this link on how bad brain fog can get:
http://lynnefarrow.net/
Also listen to her interview.

I am convinced that Candidiasis itself a major symptom of iodine deficiency.
More here:
http://tinyurl.com/Iodine-Candida

The fluoride & bromide tests are important to show how these toxins have taken over the cells in our body and have displaced iodine which cripples our immune system.
http://tinyurl.com/iodine-and-halogen-robbers

I'm surprised that you do not also suffer from cold hands & cold feet with below normal body temperature. This also results from iodine deficiency in many cases. Maybe you are but just didn't mention it. Also another Candidiasis symptom.

Grizz

Stool -- I did not do the test myself but here is an old post on how to choose the right test: //www.curezone.org/forums/fm.asp?i=1644536

You may need adrenal support.

That list is fairly common in the detox groups. At some point you should consider chronic mercury exposure. You could check out the lists of symptoms under the 1000 hair tests here.
http://livingnetwork.co.za/chelationnetwork/hairtest/hairtest3/

If your community does not put fluoride in your drinking water and if you live fairly close to the ocean or have other source of iodine, I would not expect that to be the biggest factor. You still might benefit from supplementing modest amounts.

I've heard that the price of the formerly well regarded Metametrix test doubled after they were bought out. This seems to be fall out from the liberal medical system imposed in the US. Smaller labs are being bought out. More people will likely want to use labs that work with their insurance.