I am thinking about getting some testing too. I drank some green tea today and it contains high levels of fluoride and I felt like crap. Fluoride and iodine are next to eachother on the periodic table of elements and fluoride can replace iodine within the body because it has a stronger bond.
The biggest symptoms for me are puffing hands, night-time urination, and feeling very very cold.
The thyroid controls a lot of your immune system and so it likely applies to just about anyone who has an illness like candida.
I recommend supporting your adrenals and thyroid at the same time.