Hi I am hypothyroid on 100mg Levothyroxine for nearly 3 years. My recent bloods were "normal" but I told my GP that some of my symptoms (tiredness -lack of energy-palpitations-dry skin -putting on weight) had come back. He said that the results were normal so I should be feeling fine. I often wonder whether I could up my dosage by half a tablet (150mg) just to see if I feel better! Has anyone ever tried this???!!!