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It is difficult to conclude...
Low blood sugar
from long fast might have caused fainting.
could have contributed...
/ irregular or fast heart rate
could have reduced the blood supply to brain.
Diovan can conserve potassium /your supplementation could have lead to electrolyte disturbance...
School events may not have a bearing after a long symptom free interval..
It is wiser to see your GP / get examined and have some basic work up
Wishing speedy recovery