I was feeling horrendous around Christmas, went into town shopping and would have to go home after about 15 mins due to nearly falling asleep and exhaustion, couldn't function at work etc. I had a blood test, it came back as underactive 11 on the scale whatever that means i'm not sure. I was put on 50mcg thyroxine immediately and was feeling much better. 3 months later I have a follow up test and she claims its all normal now so ive been advised to come off all medication completely, just as I was starting to feel better. I'm aged 22. hope I don't start feeling awful again.