Hi There After going through your query I understand your concern. I would like to tell you that blood pressure can drop during or after the surgery due to various reasons like, anesthetic drug, hypovolemic shock and septic shock etc. Dizziness can be associated with atrial Fibrillation or your analgesic. to maintain your blood pressure at home kindly follow these - Stand up slowly - Avoid caffeine and alcohol - Staying hydrated helps prevent low blood pressure. - High salt diet Kindly consult with your Cardiologist for Low Blood pressure management. Hope to have been helpful. Kind Regards Dr. Navneet Bansal