Hi E,
Your primary thyroid hormones are T4 and T3 and they're best measured as free T4 and free T3 (FT4 and FT3 levels). We have about 8 times as much FT4 as FT3 so the FT4 level is primarily used when deciding on treatment. FT3 is more potent than FT4, however, and that's why you're noticing symptoms. TSH is a pituitary hormone that helps regulate thyroid hormone levels. TSH tells thyroid cells to produce more hormone. As soon as thyroid levels begin to rise the pituitary decreases TSH production. In most cases, TSH falls very low, usually to less than .01 mu/L, before thyroid hormone levels rise abnormally high. Palpitations and fatigue are common symptoms in Graves' disease.
I'd probably use the Thyrosoothe that you ordered and make some dietary changes and then have your labs tested again in 6-8 weeks. FT3 typically takes longer to fall than FT4 but within 8 weeks you may see both FT4 and FT3 falling within the normal or refererence range. TSH, however, typically stays low for a long time, although if your thyroid hormone levels fall too low it could rise.
With a normal FT4 and FT3 and a low TSH, you'd be considered as having subclinical hyperthyroidism, and this condition can usually be treated easily with alternative medicine. Subclinical disorders also often resolve on their own.
If you aren't successful in lowering your levels with alternative meds and lifestyle/dietary changes, methimazole would be recommended over PTU. Best to you, Elaine