What is the possible cause for increased heart rate?

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It can be a sinus tachycardia. A sinus tachycardia is a sinus rhythm with an elevated rate of impulses, defined as a rate greater than 100 beats per minute in an average adult. The normal resting heart rate in an average adult ranges from 60 to 100 beats per minute. There are a number of causes for a sinus tachycardia. The most common causes include anemia, smoking (increased nicotine acts as a stimulant) or elevated anxiety level. Drugs like Propranolol and Clonazepam will be given to you initially for 21 days depending on your anxiety levels, sleep cycle and habits (smoking or alcohol use).