1.- You could use a lot more reading about iodine. Buy Dr Brwonstein's book, dig in this forum. It will save you lots of trouble now or in the future. Read about the cofactors and why are they necessary. Read about how to deal with bromine detox reactions. Read, read, read!
2.- No, don't use brazilian nuts because you don't know how much selenium are in them. Use supplemental selenium in the form of SelenoMethionine (it's cheap). Minimum 200mcg day, average 400mcg day.
3.- I can't find the product you said in the WWW. Please tell us what is it composed of and how much iodine/iodide are you taking. Vita Royal website mentions Dr Abraham and Brownstein so I guess their product is ok, but post the details.