If your doctor wants to remove your thyroid, I don't know how you could make things worse, except maybe to feel worse. I appreciate that you replied, "Toxic Multinodular Goiter." That helps define what you're dealing with. To further clarify, when you say your thyroid tests are "intermittently bad," what does that mean? You need to be specific, because there are so many ways that people try to help themselves. Which iodine are you taking and how much? Which medicine did your doctor give you that made you ill? Are you taking selenium or supplementing in any other way?
Hayley3, you have gotten us going! Now I'm missing things you've already posted :) I see you're taking half an Iodoral, so that's 6.25 mg. You're hyper, but not diagnosed Graves'. I got the idea you were tested for Hashimoto's and that was ruled out. You have a hot thyroid nodule, and a second one has been found. I'm summarizing so you can comment if something's amiss.
If you actually read credible sources ie. Dr. David Brownstein -- (http://www.iodine4health.com will get you started) who has been researching iodine for the last decade or so, then you would know that iodine DOES NOT attack the thyroid. The antibodies attack the thyroid. IN FACT, adequate amounts of iodine and selenium WILL SUPPRESS the antibodies. This has been experienced over and over again by many, many iodine enlightened hashimoto's folks!
In fact, with hasimotos, if you 1)do not get adequate amounts of desiccated thyroid meds and 2) don't take adequate amounts of selenium and iodine the antibodies will continue to increase and burn up the thyroid. And 3)we are learning it may be very important to go gluten free.
I also want to point out http://www.naturalthyroidchoices.com
It is a pro-iodine site run by a woman who is a patient of Dr. David Brownstein, former thyroid cancer patient and wife to a hashimoto's patient who has TOTALLY suppressed the antibodies with just iodine and selenium!! He caught the disease early and at this point doesn't need thyroid meds. If and when he gets to that point, he'll eschew synthroid (T4) for desiccated thyroid which contains T1, T2, T3 and T4.