I have my first appointment with a cardiologist bc of a fast heart rate,would he proscribe anxiety meds if that's what causing my fast heart rate?

Can't say: Some cardiologists may be willing to prescribe an anxiolytic medication. However, many would recommend assessment by a psychiatrist or pyschologist to verify diagnosis. I doubt that many cardiologists would continue to follow you to prescribe anxiolytic if there is no actual cardiac problem.

Anxiety: Not likely- if the heart checks out ok, then he will refer back to your primary care physician for anxiety medications if needed.

Not likely: The cardiologist will most likely rule out cardiac causes for your symptoms. If anxiety is determined to be involved in your symptoms, a trial of anti anxiety meds may be used, most likely by your primary care doc or a consulting psychiatrist.