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Itching may be incidental or a reaction to one of the drugs, you are taking.
Giddiness is often from the Ear.
However, in your situation, disorders of rate / rhythm or fluctuations of blood pressure or sugar / anaemia
and so on, have to be considered.
Very likely, your doctor might have worked them out and has reassured.
In case of doubt, a second opinion
Wishing speedy recovery