I was diagnosed with an overactive thyroid in August and after a rocky 6 months my energy and weight returned and I generally feel good. I had my first blood test since December last week and got a letter sent out with my results, prior to this I was just instructed via the phone to reduce my Carbimazole. The letter instructs me to drop my dosage to 5mg, I was initially on 40mg. The letter stated my T3 & T4 are normal, but my TSH level is 8.89. Should I be concerned with this or is this to be expected? The overactive thyroid was initially caused by Amiodarone that I was taking for a heart arrhythmia which I no longer take.