Iodine Water Purification & Hyperthyroidism

I never knew until after getting out of the Marine Corps I was clinically diagnosed with hyperthyroidism while I was in. If you had asked me, I was just a dude who struggled with weight gain and well could eat about anything and didn't have to worry about my calories. However, later on in my life I took a turn for the opposite I went from hyperthyroidism to hypothyroidism. And well if your like me you have probably been told you going to have to take some medication for your thyroid problem something like levothyroxine. Which just happens to be the very drug I have been taking for a while. What really got me was how little my doctor was telling me about my thyroid issue, except for I guess what they deem pertinent information, if what we are ever really told is really what we need to know. And I say this because it was not till I was reading in Merck Manual of Diagnosis and Treatment 12th Edition I was shocked what I happened to learn. In the subject of nutritional disorders I just happen to run across iodine. And well as my eyes began to skim down slowly while reading I was shocked, to say the least. As I read in the section labeled treatment to read these hard to hear words, "Iodide with or without levothyroxine." I was totally in dismay as the documentation stipulated if iodine is a deficiency that being if one's body is only taking in less than 20 mcg a day. That instead of giving Iodine as a treatment while monitoring the persons TSH levels of 150 mcg of iodide one can be given in place of iodine levothyroxine? until the levels are normal and reach less than 5 uIU/mL (milliliter). I was completely floored once I read that. I was like, "what you mean to say hyperthyroidism is caused by having to much iodine in my system and hypothyroidism is basically a iodine deficiency?" Here is exactly what they say "If iodine deficiency is severe, the patient becomes hypothyroid, a rare occurrence in the US since the advent of iodized salt." (chapter 173 Thyroid Disorders) 

One of the main causes for hyperthyroidism is excess iodine ingestion. Some causes can be do to medication which contains iodine such as amiodarone an expectorant which contains iodine. Or can possible be caused by on who has undergone a radiologic study using iodine-rich contrast agents. Or the cause may be simple an excess of iodine ingestion such as dairy products (such as milk, yogurt, and cheese) and products made from grains (like breads and cereals), which are the major sources of iodine. And since your thyroid absorbs literally all the iodine that exist in your body, now you can understand why people who are suffering from hyperthyroid can not take iodine as a form of water purification, as it will only create iodine toxicity and well in the end result in inhibiting hormone synthesis in the thyroid itself. Thus iodine toxicity can eventually cause iodine goiter which is an enlargement of the thyroid gland, or cause the gland to not work thus creating hypothyroidism or myxedema (refers to cold tolerance, fatigue, sluggishness, skin coarsening, weight gain, mental dullness and in women menstrual irregularities). So if you know someone who has hypothyroid well in his case he is in the clear, but if he is hyperthyroid use some other means instead.