The daft thing is I went to see him because of my extreme fatigue, exhaustion and lethargy. (As well as a racing heartbeat which i assumed was anaemia). I was stunned when he told me I had an over active thyroid as I thought this would have caused the opposite symptoms - a sort of manic energy. Has anyone had the same experience/symptoms? Will the carbimazole help to restore my energy levels? I feel like an old woman at 51!