Hi I'm a 71 year old woman who was diagnosed with an underactive thyroid about 20 years ago after I had private blood tests. My GP said I was in normal range according to NHS blood test but private blood tests showed otherwise. I started on 25 mcg and at one time went up to 75 mcg. I have been on 25 mcg of Levothyrine for a number of years now and felt fine. Blood tests were fine too. When I had a blood test in Dec 2017 my GP said it showed I was having too much so told me to take 1 every other day. I was retested 2 months later and GP said I was still on too much and stopped thyroine altogether. I have to be retested in April. However I have since been feeling very tired, my skin is dry and I sometimes feel a bit light headed and nauseous. I am trying to lose weight but I really have to cut right down to 1100 calories and then I lose it really slowly. My GP says its very unusual to have to come off thyroxine and I am worried. I don't want to develop an overactive thyroid but I'm struggling.Should I have private blood tests again?