Hi, I am thirteen and I was born without a thyroid. At all. Zero amount of the gland. I was on synthroid until I was 10 and then was put on Levothyroxine, and currently on 125 mg. My parents are divorced and I go back and forth from their houses quite often, and forget to take it most days. I know it makes me tired and I just want to lay around all day and I don't as good as a metabolism, but what other affects does not taking my medicine have on my health?