Large overactive thyroid is generally a treatable autoimmune thyroiditis. Free T3, Free T4, an TPO antibodies and unless we see nodules and US is fine.If you are indeed HYPER THYROID /how hyperthyroid are you, and is it documented autoimmune? Great that it appears it's a goiter and not nodular......and you need eval with Endocrinologist. Foods will make zero difference.Just eat healthy whole foods.
The RAI scan is not a good way to measure thyroid size (10% acuracy) ; ultrasound is better!
hyperactivity means it has increased function; so it is not sleeping, it rather sleepless