Significant increase in heart rate when frightened which doesn't decrease as normal. Inability to think clearly, or brain fog. Psychiatric problems associated with the above symptoms. Thyroid storms which are periods of severe rapid heart beat which makes you wonder if you're going to live or die. Hyperthyroidism is a very serious situation and life threatening.
People die every day of it.
If you are having thyroid storms, you need to get to a doctor as soon as possible. You are in real trouble and could die of a heart attack. You may need to take 6-12 capsules to control a thyroid storm. Also read the foods not to take as these can precipitate a thyroid storm. The antithyroid medications are not dangerous for most people.