Hi I had my thyroid out 2 years ok , due to a goitre , on my voice box , I have been struggling with my levels , I was on eutroxsig thyroxine tablet 100 ml , only 4 day ago my levels were very low, so my doctor upped them to 150 ,what big difference will I notice if that works , I have been very tired , brain fog , weight gain easy , just not myself .