l have been hypothyroid for 20 years. I have recently had my daily dose reduced from 75mg to 50 as a result of my GP advising l had gone slightly hyper. Thyroid test repeated 4 weeks later and GP confirmed my results are normal. I feel anything but normal since the reduction. Symptoms include exhaustion unable to pick up my energy even needing to sleep in the afternoon, dizzy spells and loss of balance, impaired cognitive ability, poor memory and now excruciating migraine attacks. My GP said it could be depression and offered Seretonin which it definitely is not and l refused it. My GP has also referred me for Chronic Fatigue. I maintain a healthy vegetarian diet, don't drink or smoke. My GP won't budge and l don't know what to do. My cognitive and physical health are rapidly going down the pan. Please can anyone advise.