Hello and welcome to HealthcareMagic.
This is nonspecific sign and
dizziness is symptom of many possible disorders
One possibility for it would be anemia, which commonly manifests with dizziness andtiredness.
Heart rhythm and function abnormalities would also lead to insufficient blood supply to the brain and other organs so would also justify those symptoms.
Another possibility would be metabolic alterations, like diabetes, altered kidney or liver function, electrolyte abnormalities. Hormonal causes like
thyroid dysfunction or nutritional ones like
vitamin B12 deficiencies must be considered as well.
If the symptoms have appeared only very recently it might be a simple transitory viral infection which are generally transitory and need only rest and hydration.
So I would start evaluation with some routine cheap tests to screen for anemia, infections and metabolic issues like
complete blood count,
erythrocyte sedimentation rate, glucose, liver and kidney function, electrolyte panel, thyroid function, vitamin B12 levels, EKG.
I remain at your disposal for other questions.