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You will need examination and investigation.
It could be missed beats and pain from chest wall muscles...
EKG / HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise ECG) / LABORATORY work-up – may all be necessary for further assessment and assistance.
Low blood pressure in the absence of any other disease (especially of the heart) can be a normal finding and needs no worry or interference.
You must see a doctor. The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery