The clinical setting of high TSH and T4 with tremors and diarrhea signifies hypehyroidism due to either a TSH secreting pituitary tumor (secondary hypehyroidism) or elevated TRH secretion from hypothalamus (teiary hypehyroidism). But the presence of "Bi-temporal hemianopia" localizes the lesion to Pituitary mass compressing the optic chiasma. Hence, the diagnosis is most likely TSH secreting Pituitary Adenoma. Radioiodine or anti-thyroid drugs can be used to control thyrotoxicosis and do urgent MRI to confirm the diagnosis. A combination of trans-sphenoidal surgery, sella irradiation, and octreotide may be required to normalize TSH, because many of these tumors are large and locally invasive at the time of diagnosis.