Thanks for providing more information.
As per your description,potential differential diagnosis may include Atherosclerosis of carotid artery,Nerve compression,Autonomic dysfunction,Vitamin B 12 deficiency.
So further investigations like
Carotid doppler study.
ANSAR - a test that helps us detect a problem within the autonomic nervous system (parasympathetic and sympathetic nervous system) these are the systems that control our heart rate, blood pressure, sweating, coping with stress, digesting food, urinary and bowel functions and any imbalance among the two systems can make us very lightheaded,indigestion.
X-ray/MRI of Cervical spine to rule out nerve compression supplying face,head causing tingling sensation.
A consultation with a neurologist should be considered as well.
Hope this helps.
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