First Cardio Visit Yesterday. Frightened!!

Went to see a cardiologist yesterday after having a very high pulse only after 5 minutes at gym.  They took an EKG and it was 130.  I was shaken up.  He said I have arrhythmia but he  gave me no further information.  He ordered an
Echo and 24-hour heart halter.  After that he will do a stress test.  Also he put me on Coreg CR.  I have been extremely anxious as I really have no idea what is wrong.  Has anyone experienced anything like this?  Thanks for any feedback you could give me.  

[kenkeith]

The EKG must not have provided a cause for your tachycardia, because he has recommended a 24 hour monitor to capture any irregularity of electric signals. Arrhythmia is a fast heart rate and/or other symptoms.  The fast heart rate can be sourced to the sinus node (heart's pacemaker) from there it goes to a node that regulates a normal rhythm, etc...an EKG should be able to diagnosed either condition  Also, it could be the thyroid gland, etc.

I had a faster than normal heart rate at rest (115) and that was due to a coronary artery disease.  There are many causes for tachycardia and would need more information to be more informative.  

"Coronary artery disease
High blood pressure
Changes in the heart muscle (cardiomyopathy)
Valve disorders
Electrolyte imbalances in the blood, such as sodium or potassium
Injury from a heart attack
The healing process after heart surgery
Other medical conditions."

The coreg is a beta blocker and slows the heart rate and prevent and manage the heart rate,  

Thanks for your question, and if you have any further questions or comments you are welcome to respond.  Take care.

Ken