I have been taken 100 mcg of Synthroid for a year now and I have had weight gain, sleepless nights, and hair loss on my left-side of my head. Once, it stopped my menstrual cycle for two months. So, I decided to decrease on my own from 100 mcg to 50 mcg. Afterward, my hair loss started to increase. So, I started taking 100 mcg instead of the 50 mcg. Did I do something wrong? I want to have children.