I was first diagnosed with hypothyroidism in 1955. I was originally given Armour thyroid supplement. I might as well have taken nothing. Along in the late 1960 s, I was given Synthroid. The difference was like night and day! Then they started increasing my dosage. Finally I was taking what I recall as a blue round barrel shaped pill, but I don t remember the dosage. But with that, I went back to 9th grade, and with 3 teenagers and 5 five-year-olds at home, I was able to go to college and get my degree. I am female, 5 4 , and averaged 170lbs. all those years. After having surgery for hiatal hernia in 2011, I dropped to 115 lbs. Now, at age 74, they ve been decreasing my dosage gradually for several years. I had gained back to 140 lbs., but I have been sick this last 6 months or so, they said a urinary infection, treated me 6 times for that before admitting that only once had I tested positive for that. I ve had dizzy spells that I would classify as seizures, forgetfulness, even amnesia, feel weak and tired, and am down to 120 lbs. now. While this is going on my thyroid dosage has been lowered twice, is now at 0.100MG, and the latest test, they said that my thyroid is low, so it needs to be lowered further. I asked if it is low, why does it need to be lowered further, and it has been explained to me 3 times that low really means high, so it needs to be lowered further. This makes no sense to me. Can you explain it so that I can understand?