I'm sorry you are going through all of this! For what it is worth, I had some nasty symptoms and my docs started looking for cancer.
I had severe left side lymph swelling - throat and victors nodule (above collarbone) for months. It came on so suddenly and got worse every week. My trachea was slightly pushed to the right and I was choking all the time, I had trouble eating/keeping food down and I had plugged ears, sore throat, almost like I had an infection, allergies, etc. My left arm was numb/tingling for months and I had intense back/arm/neck pain. I could barely turn my neck. However I tested negative for everything, and my docs said my symptoms could not be thyroid related. I had ultrasounds, endoscopy, blood work, xrays it went on and on. I even went to emergency once the choking was so bad. Docs were worried and so was I.
In the end I started NDT and all of my symptoms are going away, first my numb arm and then my lymph nodes.
I know it is a long scary road until you know what is going on but I had cancer indicators and I definately do not have cancer.
I hope this helps, take good care, Kel
First of all, let me say that your high TPOab indicates that you have Hashimoto's, which is an autoimmune thyroid condition. Hashimoto's is the number 1 cause of hypothyroidism in the developed world, but is often characterized by periods of hyperthyroidism, which, apparently, you have, since you say you have low TSH, but high end Free T4 and Total T3.
Nodules are very common with Hashimoto's and are, typically, not an issue unless their characteristics are unusual. Here's where we run into trouble with yours, because apparently, you have one (or more) with unusual characteristics, so let's go there...
Less than 5% of all thyroid nodules turn out to be cancer in the first place. I can't imagine why you settled on Anaplastic Thyroid Cancer --- it's the least common of all thyroid cancers and accounts for only about 1% of all thyroid cancers... Even the U/S says the nodule is "well encapsulated"
Secondly, thyroid cancer is one of the easiest to cure, in that, typically, the thyroid is removed and the cancer goes with it. The worst that happens is that you end up with hypothyroidism and take a pill every day to replace the hormones your thyroid would have produced if you still had a thyroid... There are a lot of us here on the forum that haven't had our thyroid removed, but we still take that pill every day because our thyroid has been destroyed by the disease called Hashimoto's, which you also have...
I apologize if it sounds like I'm downplaying the large nodule on your right lobe... I'm not, but you've actually given it a life of its own, by calling it a "he" (or maybe the doctor did that) and you need to take that away. I'm sure it feels like it's getting larger by the minute and it may be growing, but I doubt it's growing "that" fast... when we're afraid, it's easy to let anxiety rule us.
Why not tell us about your thyroid hormone levels. What were the actual numbers? Be sure to include reference ranges, since those vary lab to lab and have to come from your own report...
Do you have symptoms of hyperthyroidism?
This will all be important later on, because the chance of cancer spreading (if it "is" cancer) are so slim, it's almost non-existent and you need to be informed about optimal thyroid hormone levels, what tests need to be done each time you have labs (Total T3 is obsolete), etc.
Once you've had your biopsy on Monday, we can help you prepare for the next step and be here for whatever comes down the road.