Hi, Let me try and make it bit easy to understand what may be going on. Light headedness /dizziness with headache can be do to variety of reasons 1) LOW BLOOD SUGAR Causes for low blood sugar are a) G6PD enzyme deficiency (enzyme needed release energy from glucose, mostly associated with anemia, hemolytic anemia, and will be mostly detected early in life) b) low caloric / sugar intake 2) LOW BLOOD PRESSURE causes for low blood pressure a) Hypothyrodism (low thyroid hormone, associated with fatigue, low energy and weight gain) b) bradycardia (low heart rate) c) heart failure (heart to weak to pump blood) d) liver diseases e) low sugar f) Postural hypotension (position induced low blood pressure) 3) LABYRINTH APPARATUS PROBLEMS ( a organ present in ear which helps the sense of position) cause of problems a) Menier s Diseases , ( person feels dizzy, and associated with some hearing loss) b) Viral labyrinthitis (person feels dizzy, or sensation of room moving around , vertigo) c) otolith (small stone in ear canal makes feed dizzy , but dizziness comes at certain position/movement only). FROM THE DESCRIPTION it seems like a VIRAL LYBRINTHITIS or Hypothyrodism but nothing can be said for sure, as I don t know which lab tests has been done and what was the result of those to vote out some of the other diagnosis ADVICE: 1) If possible try to CONSULT other Physician/ NEUROLOGIST (Brain doctor) 2) There are number of test that still needed to be done in order to come to conclusion which are as follow a) MRI-BRAIN b) blood test of thyroid hormone level check, lever enzyme profile, sugar level c) physical test for orthostatic hypotension (position induced low blood pressure) d) Audiometery to check any HEARING changes/problems e) labyrinthine stimulus test to check the apparatus. 3) THE DIAGNOSIS made by your physician G6PD is not a likely diagnosis as it is associated with hemolytic anemias (blood cell rupture in blood vessels leading to less blood cell but to stress ) Hope it helps.