This pre-syncope (like lightheadedness and dizziness) is very early stage of syncope which may last for few seconds to minutes and can be prevented by early interventions measures like lying down, elevation of legs, deep breathing, immediate glucose drink
and inhalation of any stimulant like spirit of
ammonia etc. Please arrange an appointment with a neurologist who will evaluate the further prognosis here and can provide you an appropriate treatment. Hope this helps.