The cause of quite a few heart beat abnormalities can be caused by hyperthyroidism
. There are many instances of resting heart beats of 180 in extreme cases. So have them check your heart , but have a T4 test . that will check for thyroid abnormalities. My brother developed this problem and over time was bordering on 169 -180 resting heart beats with blood pressure of 150 over 110. He is a big man and lost 100 pounds in 6 months before he saw a doctor.