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He ought to see a doctor! There is no alternative…
He needs examination / and probably investigation...
It may be from postural hypo-tension.. Did you check the BP – standing and lying?
It can be from anaemia – what is his haemoglobin?
EKG / HOLTER (24 to 48 hour ambulatory monitoring – for arrhythmia
) / ECHOcardiogram
(for clot) / TMT (Treadmill exercise ECG – for ischemia
) / LABORATORY work-up – may all be necessary for further assessment and assistance.
If there are no clues, he should be followed up by a neurologist
. / MRI may be needed. MRA (MRI angiography
) shows blood vessels and is generally done at the same sitting.
Wishing all well