I would recommend a free T3. T3 is the active form of thyroid hormone. If it is the normal range, especially if in the high normal range, it might behoove you to continue watchful waiting. Once you r placed on thyroid hormones, it is generally for life.

A recent study out of Hopkins showed an increase risk of osteoporosis in patients taking thyroid hormones who were over 65, even when it was dosed correctly (normal TSH)

That being said, it does sound as though your symptoms could be consistent with hypothyroidism. A dose of 25 mcg is very low, and it appears your doc is acting with appropriate caution. If you choose to go the route of taking thyroid hormones, I would discuss the Hopkins study with your doc. My “reading between the lines “ of the Hopkins study, as it is just one study and I’m sure more will be coming (though slower since most of the federal funding has been pulled) is to aim for a TSH of 3-4, instead of what was generally done previously which was simply to aim for a TSH in the normal range (around 0.5-4)