History of benign thyroid adenoma removal with confirmed biopsy of Hashimoto's. Still have numerous stable(in size) nodules. TSH went from1.8 in March, 2009, to 0.185 (0.400 - 5.300) in November, 2009. Would probable cause be: (1) new adenoma with hormone secretion (2) Pituitary problem (3) Adrenal insufficiency????? Symptoms: bradycardia (56- 60), occasional PVC/PAC's, cold intolerance, irritability, fatigue (physically overwhelming at times), difficulty sleeping, nervousness/depression. I am only on Climara Patch/postmenopausal however have been under alot of stress in the last six month with family health issues..