Re: hot thyroid nodule treatment
Please understand, I'm just a layperson who's read a lot about thyroid disease.
I'm so sorry for your loss. Every widow I've known developed some kind of health problem shortly after their loss. I can't say that's what's happened to you, but I wouldn't be surprised.
You are definitely hyperthyroid and must surely be feeling it. Your free T4/3 are above the standard ranges, and those are the levels that account for symptoms. You need some kind of treatment to prevent serious complications from those excessive thyroid hormone levels.
Four months seems to me too long to wait for a follow-up visit. Two to three months seems more reasonable. If you begin to feel markedly worse, with high heart rate, blood pressure, fever, sweating, diarrhea, shakiness, confusion, and/or anxiety, go to an emergency room. There is a life-threatening situation called "thyroid storm" that occurs from high circulating levels of thyroid hormones. It's somewhat unusual, but you need to be aware of it and what to do if it happens.
I-131 therapy is not that precise, no matter what you've been told. The theory is to hit the gland with just enough radiation to curb hormone production without making the patient hypothyroid. But it isn't that simple, and most people will experience some permanent degree of hypothyroidism.
You might choose to remain on methimazole for the time being and see what happens. I've seen at least one report that says about 1/3 of hot nodules eventually "burn out". In the interim, you could consider the value of having the lobe of the gland containing the hot nodule surgically removed. You'd probably still become hypothyroid, but at least the nodule and its excess hormone production would be gone.
This is just me personally... I'd choose drug treatment first. If that didn't do the job completely, I'd choose surgery second. I'm just not that comfortable with radiation's potential long term effects.
The book Thyroid for Dummies addresses all aspects of thyroid function, dysfunction, and treatments. Reading it may help you decide for yourself the course you want to follow.