Hello dear, Thank you for your question. I have carefully read your situation. Your previous history of relatively low blood pressure seems to exclude hypotension as a cause of dizziness. Another important cause of dizziness are the vestibular disorders. The dizziness and lightheadedness that attenuate before your periods, can be explained by the increased sensitivity of your body because of the hormonal changes. Hormones involved in the menstrual cycle tend to produce a retention effect of water and salt, which contributes to increased vestibular pressure and the subsequent symptoms. I usually advise my patients to avoid caffeine, cigarettes, a moderate intake of liquids, a diet restricted in sodium. If you feel that your problem is geting worse you might need to consult an ENT specialist to reevaluate your vestibular disorder. I hope this helped. If you have any other question, do not hesitate to contact the HCM website. Kind regards, Dr. Alma