Your fast heart rate has to be investigated for cause.
low grade infection in body is common cause of fast heart rate
CBC, URINE ROUTINE, URINE CULTURE,
THYROID FUNCTION TEST, KFT, and preferably a X ray chest too..
It all this normal and tachycardia persist a Echocardiography should be done
also, watch your temperature carefully with thermometer .
You don't need BP medicine..
For control of heart rate
Tablet Propranolol 10 mg twice daily will help..