I am hypothyroid and have been taking armour thyroid(for about 3 months). At first I felt great, but then started having heart palpitations and insomnia. Sometimes at night, I wake up with my heart beating fast. I feel as if I am going to have a panic attack. My doctor has reduced the dosage to 15 mg, which is not much at all. I started with 30 mg, and then went up to 60 mg. A cortisol test I recently did showed my cortisol is low in the morning and high in the evening. Could that also have something to do with it? I am taking a supplement Adrenplus 300 to help with the adrenal issues. It gets a little scarey!! I also am on compounded estrogen and progesterone.