Its amazing. I did not feel great, but then I started taking Synthroid and I really started feeling bad. Always hot, off balance, dizzy, headaches, my eyebrow and eyelid area is always swollen and painful, eyes are dry, muscles ache….I feel like I am missing out on things with my family. Why do I feel like this? The doctor told me taking Synthroid could not be causing all these problems. Then what is? I have had everything else tested.