The ranges are
Tsh .34-5.00
Free T4 .60-1.80
Thyroglobulin 0.0-55.0
Vit D >29
From your symptoms and limited thyroid related test results it is likely you are hypothyroid. With your relatively low TSH and negative TPO ab test, there is no indication of Hashimoto's Thyroiditis. Instead, with your TSH and Free T4 that has ranged from a low of 21% of its range, to 46% more recently, there is the suggestion of central hypothyroidism. Central is cue to a dysfunction in the hypothalamus/pituitary system that results in TSH levels that are too low to adequately stimulate the thyroid gland to produce hormone.
Your status would be a lot more definitive if you were tested adequately. You should make sure they always test for both of the biologically active thyroid hormones, Free T4 and Free T3. Doctors tend to think that T4 always converts to T3 as needed, but that is erroneous. So you need to also know your Free T3 level since it is the thyroid hormone that is metabolized in cells throughout the body to produce needed energy. In addition, in some situations, T4 is converted to excess Reverse T3, which can block the effect of Free T3 and create hypo conditions. So it is good to test for Reverse t3 also, at least at the beginning.
Since hypo patients are so frequently deficient in Vitamin D, B12 and ferritin those need to be tested and supplemented as needed to optimize. D should be at least 50 ng/mL, B12 in the upper end of its range, and ferritin should be at least 100. It is also good to test for cortisol to confirm adequacy.
Most important of all is to have a good thyroid doctor. By that I mean one that will do the needed tests, and treat clinically, by adjusting Free T4 and Free T3 levels as necessary to relieve symptoms, without being influenced by resultant TSH levels. Symptom relief should be all important, not just test results. If your doctor is unwilling to do these tests and treat clinically, then you are going to have to find one that will do so.
If you want to confirm what I say, I highly recommend reading at least the first two pages of the following link, and more if you want to get into the discussion and scientific evidence of all that is recommended. http://www.thyroiduk.org.uk/tuk/TUK_PDFs/diagnosis_and_treatment_of_hypothyroidism_issue_1.pdf
Thyroid related test results should always be compared to reference ranges shown on the lab report. Please post those.
They also tested
Hemoglobin A1C- 5.2%
Mean plasma glucose- 107mg
My tsh was tested
2014- .06
2016- .54
2016- .29
2017- .51
Free Thyroxine
2014- .96
2016- .85
2017- 1.11
Thyroglobulin
2017- 12.7
Vit D
2017- 24
I'll leave assessment of your ultrasound results to someone who knows more about it. But we will need to know your actual thyroid related test results and reference ranges shown on the lab report. Also, if tested for Vitamin D, B12 and ferritin, please post those results as well.
That last one was 7/11/2017 Not 14.