Hello, Probably you may be suffering from postural hypotension may be due to infection or cardiac dysfunction or autonomic neuropathy or anemia or arrythmia or vestibular neurinitis etc. Until examination is done it is difficult to say what it is. Please don t do high risk activities like driving, climbing or cooking etc. Check your blood pressure and blood sugar. Please consult your physician he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further.