The heart normally beats at a rate of 60 to 100 times per minute
A pulse can be abnormally slow or fast, and irregular at the same time.
An irregular pulse, with beats coming at varying intervals.
A fast pulse rates, called tachycardia (a heart rate of more than 100 beats per minute), can indicate a high thyroid hormone level, or hyperthyroidism, or by an adrenal gland tumor called pheochromocytoma.
Also can occur normally during and after exercise, can indicate an electrical problem in the heart, often called an arrhythmia. For example, an electrical problem called atrial tachycardia may cause a fast pulse rate. Can be caused by many other conditions, including fever, dehydration, fear, hormone problems, and heart defects. A heart defect known as teratology of Fallot may also cause a fast pulse rate.
Tachycardia can be a side effect of some foods and drinks, including coffee, tea, alcohol and chocolate; tobacco; or medication, including epinephrine (used in various medications), ephedrine (used in various medications), aminophylline (Phyllocontin, Truphylline), atropine (used in various medications), digoxin (Lanoxin) and others.
A slow pulse rates, called bradycardia, can indicate low thyroid hormone levels, called hypothyroidism. As well as other issues.
Good Luck and Best Wishes for 2008.
(My information and comments are not meant to offend or be offensive nor obnoxious, they are what they are, just information and comment - GL)
You need to get on the phone with a dr pronto. They need to test your blood again and possibly be on some kind of thyroid med. They need to figure out if you are hypo or hyper since they have said both. Get on the phone and tell your dr what is going on.
Let us know.
Dac