I was diagnosed with under active thyroid 3 years ago. My bloods were really rather bad and I was immediately started on Levo and I'm currently on 125mg. My symptoms just don't seem to get better. I am so tired and exhausted, the brain fog is so frustrating and frankly inconvenient. I've noticed this week that there is a lot of talk about T3 and T4 medication. I really need to try and improve my symptoms. Please could anyone help with these medications?