My thyroid was removed six years ago because of cancer. In April 2011, I became hyper--couldn't sleep at night and blood pressure went up-- and had to cut the dose from 2 grains to 1 1/2. Recently, I have had to cut it again. The morning dose of 1 grain seems to go to my head making me feel head achy and hyper for about 5 hours. Has anyone else had these symptoms? I have been taking Armour Thyroid since my first surgery 35 years ago.