Hi I've been on Thyroxine 100mcg for 16months. over the past 4 weeks I have been suffering from chronic fatigue, dizzy spells, breathlessness, my nail beds are white, pain in legs and just generally feel terrible. My FBC is all in range and also my Thyroid function. My GP sent me for an ECG and chest x-ray yesterday which I'm convinced will be fine. As my FBC were fine she refused to complete any tests re iron deficiency as "your not anaemic". I have been looking into this and looking at some posts it seems that B12 deficiency or panaceas anaemia doesn't always reduce you red blood cell count. (family history of B12 panaceas anaemia)I have contacted the GP and requested B12, vit D and tests for Anaemia but have been told I will have to speak to another GP. I'm fed up ! I'm sleeping when not at work which isn't good as I have two small children!