I'm hyperthyroid nd now have CHF after storm. Can the CHF go away after my thyroidectomy? I'm scare d to die.

Yes. You will need thyroid replacement hormone for the rest of your life and will be monitored with frequent blood tests for TSH (Thyroid Stimulating Hormone). You will see an endocrinologist and a cardiologist who will monitor how you are faring and you should do quite well.