I've been underactive now for a few years. I was referred to an endocrinologist as I was having bad palpitations, extreme anxiety and dizziness with brain fog. He tested me and at that point the results were t4 16.8 tsh 6.86 and t3 3.8. He is going to trial me on a small dose of t3 but due to waiting times of a follow up appointment he asked my GP to increase my Levo from 75 to 100mcg in the meantime. I've been tested twice since by gp, after 3 weeks on 100mcg = t4 24 and tsh 0.33, then after another 2 weeks t4 24.6 and tsh 0.11. I've been told to now alternate 75mcg and 100mcg every other day. What does all this mean feel awful!? I'm waiting for the next endo appointment to see about t3 and hear about antibodies results.