Clearly you are suffering from severe Iodine deficiency. Your sensitivity to cold is caused by low thyroid and the thyroid requires Iodine to function properly. The brain requires Iodine to think clearly. Brain fog is a very common symptom as you will see.
Complete details here: https://sites.google.com/site/iodinereferenes/home
I suggest reading the book specified.
NEVER take iodine without also taking 200yg of selenium, as specified at this web site. You can also get additional help at the Iodine VWT Forum.