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Heart is one cause for giddiness - especially arrhythmia
Slow heart rate
is a specific pointer for further investigations...
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.
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Ear and The Nervous system are the other / and common causes...
Wishing speedy recovery