My doctor suggested to move from 60 mg armour to 90 mg. I am conceded because I am not having any of the symptoms other than being a little tired and my eyes are red. I am scared because I am not sure if 30 more mg or armour will give me heart palpitations. I was looking the conversion table of armour vs synthroid vs naturethroid. Naturethroid has 15 mg and synthroid also has 25 mg. my ends is great and she does not mind if I add synthroid or nature thiroid extra to my current 60 mg of armour. What should I do? I am sacred of the heart palpitations. Which one is better?