Hi, 1st time on here and just wanting some advise. i have an under active thyroid and was put on thyroxine several years ago. i have been on the same dose ever since although i have lost 10 stone in between! i am constantly drained and feel weak. my results have just come back as TSH level 0.78 miu/l and T3 at 1.4 nmol/l the doctor just says its normal but the TSH seems quite low.