I am not having pain in chest and not hardness in...

Treatment of fast heart beat:
As there are many causes for fast heart beat, it's recommended to visit the nearest medical center to assess your condition, detect the diagnosis and then treat you accordingly. If it's just a tachycardia, no need for any medication as it should go away by itself. In some cases such as atrial fibrillation, medication such as Bisoprolol 5mg PO once daily, and in fast heart rate other medications such as (Amiodarone infusion) is prescribed. If there is hyperthyroidism, midications such as carbimazole or methimazole along with beta-blockers such as propranolol. If there is anemia, FERROUS SULPHATE, vitamin B12 and/or folic acid are prescribed. You should also avoid stress as much as you can, and get enough rest and sleep during the day.

Diagnosis:
Diagnosis is made by performing a clinical medical examination and taking your medical history. Some medical tests can also be performed, including a complete blood count (CBC) to detect anemia or infections, an ECG and an echocardiogram to ensure the health of the heart, a thyroid hormone test to rule out problems in it, and a blood chemistry tests (urea & creatinine).

Causes of fast heart beat:
There are many causes of a rapid heartbeat, including:

• Stress
• Panic attacks
• Anemia
• Heart problems
• Hyperthyroidism
• High temperature
• Other causes

Recommednation:
It's recommended to visit the nearest medical center to you to assess your condition.