A 36 year old woman presents with a three month history of unintended weight loss, sensation of increased anxiety, heat intolerance, and reports, "I feel like my heart is going to beat right out of my chest." In addition, she reports a two-month history of increased frequency and looseness of stools. Physical exam reveals 3-4 plus Achilles and patella reflex response, mild exophthalmosis, bilateral fine tremor, and a diffusely enlarged non-tender thyroid. Heart rate 115 beats per minute at re...