Tom, is it possible that reducing dietary iodine might clear up or ameliorate some of your symptoms? Here is a cookbook for it:

http://www.thyca.org/Cookbook.pdf

As for euthanasia, some countries believe in it if you become terminal and are suffering too much. My relatives in the Netherlands tell me they have it there. Having lived through the death of a family member who experienced what I consider medical torture, I do know in my heart there are situations that warrant it. In the absence of that, discuss and write down extreme measures you do not want your family to allow. The standard forms are really not comprehensive enough. Sometimes doctors just prolong the agony.