Hello .Thanks for your query.

Blood pressure is considered low when the systolic drops below 90 mm Hg and the diastolic below 60 mm Hg. In medical terminology, it is known as hypotension as opposed to hypertension which is high blood pressure. Low blood pressure is a physiological condition and it occurs when the volume of blood in the blood vessels is insufficient to maintain the normal pressure. You have mentioned that you are suffering from low BP. Was the BP measured with the help of the bp machine when you feel dizzy?

A female during her menstrual cycle loses upto 80 ml of blood. This along with decreased food and water intake would trigger dizziness in any individual. I feel that you are experiencing a similar picture. An episode of dizziness upon standing suggests postural hypotension, a condition where the blood in the body is pooled in the lower limbs upon standing, which reduces the blood supply to the brain leading to hypotension. I would advise you to rule out the conditions like Anemia, thyroid abnormalities, excessive bleeding during the cycles, reduced salt intake, dehydration etc., before going for further treatment. Have a balanced diet with more salt and increase your water intake. Though Blood pressure on the lower end is more desired than on the other end, it is recommended to consult a physician to rule out other associated disorders.

Hope this helps.