Mine is always between 55-60 and that is normal. That is what my dr. told me. Ask for and ECG it will make you feel better.
Gary,
while lying in bed, a heart rate of 51-60 is quite normal.
Anxiety can easily cause heart palpitations and chest discomfort. Do not start thinking already about some serious illness.
Just let the heart specialist rule out any heart related causes.
If there are not any, what I expect, discuss with your doctor how to tackle your symptoms.
good luck.