I am a 50 year old very fit woman, was diagnosed with Grave on March 8. My T4 was 35.8 and my TSH was 0.01. I am working away for 13 weeks so my GP was not able to treat as he would normally - as a compromise he put me on 10mg of Carbimazole a day. Yesterday I almost fainted several times - unusual for me. I rang my GP who advised a blood test which I have had - my results are T4 25.8 and TSH 0.003. What does this mean? Am I taking the right amount of Carbimazole or should I reduce it? I seem to have responded very fast.