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The details are not descriptive enough to lead to a diagnosis.
It could be Sick Sinus Syndrome
It may be Ischemic Heart Disease
Proper treatment demands prompt diagnosis and the diagnosis needs investigation.
You need investigations.
HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise ECG) /
LABORATORY work-up – will all be necessary for proper assessment and assistance. You may even need Electro Physiological Studies (EPS)
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Medicine is well advanced nowadays – management is possible for almost all situations...
Wishing speedy recovery