** Thanks for contacting your health concern, and since some of the investigations came normal, you should consult with a Cardiologist to exclude following symptoms: i. Anxiety is the commonest cause of elevated heartbeat but first one should exclude: . Hyperthyroidism (Thyroid function test) . Arrhythmias (ECG & Holter monitoring) . Left Ventricular Hypertrophy (Chest X-ray) . Diabetes (blood sugar to exclude hypoglycemia) . Anemia (Hemoglobin level) ii. If pulse & heart appear normal then the most important cause will be anxiety and will be managed accordingly. iii. Avoid excess of tea/coffee . Avoid alcohol & smoking . Avoid mental strain. iv. Take a Medhya Rasayana or mild tranquilizer at bedtime. v. you may ask for electrolyte, fluid and glucose values