Hello. Last year I requested that my doctor start me on Armour, because I had been on Synthroid for 9 years and never felt normal on it. I felt so much better on the Armour, until a couple months in and then my chest started feeling tight and it was too much for me to handle...no matter what I did the tightness wouldnt go away. He told me to stop the Syntroid and start the Armour right away in the beginning, and he told me he had never prescribed it before. My question is what is the correct way of switching from Synthroid to Armour because I would like to try it again with my new doctor in the future. I am not asking so that I can tell my doctor how to treat me, he he, just curious myself. My thyroid antibodies are way up and I dont know if this would help or not.