your body may be saying "enough". that is always subject to change. a sabbatical from Iodine might do you some good. and get enough of the right selenium going while you are taking a break. do some niacin flushes. pick a day and do a vit C flush of 20 or more grams throughout the day. try this salt water flush for a week:
or do a mono fruit diet of oranges. or any other cleansing activity, like a raw diet. do that cilantro pesto that owen recommends. let your stores of antioxidants build up and then hit it again. you will notice a difference.