I was on 75 mcg of Levo for 9 months and then switched to Thiroyd because I was not converting T4 to T3 well, and FT3 dropped below range on my last blood test. I have been on Thiroyd for almost 4 weeks now. For the first 2 weeks I took one grain and then increased it a little to 1 1/4 grains. I have been feeling better and better once the swollen lymph nodes in my neck settled down but last night I noticed that my heart had began to pound. It did not keep me awake but has continues to thump. My heart rate has not changed and is still around 63 on waking and 70+ during the day. I am feeling a bit jittery but have no other hyper symptoms. I have looked at some previous posts on this topic so am not unduly worried but I had planned to increase my dose on Saturday to 1 1/2 grains. Now I am not sure whether to increase or reduce or just wait it out. Any advice gratefully received. Many thanks!