there might be various causes
I appreciate your concern.Feeling of Light headed on standing might be due to various causes. If i see such a patient of your age group in my clinic , I would like to rule out Anaemia
, Postural Hypotension
or any drugs leading to it.
I would advisce you to take adequate amount of fluids and maintain good hydration. In case you are taking low
sodium diet , try increasing the amount of salt in your diet.Monitor you Blood Pressure regularly , especially look for any fall in blood pressure on standing for few minutes.
Certain drugs like antihypertensives, diuretics, nitrates etc can also cause such symtoms.
In case you have persistent symptoms , then kindly contact your treating physician , who can perform a detailed physical examination and arrange for investigations like CBC, RBS, EKG, Serum Electrolytes etc.
Hope it helps
Dr. Kavita XXXXXXX