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High white blood cell count , High D Dimers and syncope could be possibly because of sepsis ( Infection in blood ) , if you have been tested negative for lung clot than possibility of blood infection is highly likely .
I will suggests you to have Blood culture , sepsis had negative effect in heart muscles , and could be the reason of fluctuation in blood pressure and heart rate .
So please proceed as I advised you .
Regards ***** ***** luck .
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