Hello! Welcome and thank you for asking on HCM! I read carefully your question and understand your concern. As her brain CT scan has resulted normal, possible brain ischemia or hemorrhage have been excluded. High blood pressure could be the cause of persistent headache. I would recommend performing a brain MRI to detect possible brain ischemic events (which are not detected by the CT scan) and a Doppler ultrasound of the cervical vessels to examine the blood flow in her cervical arteries to investigate for possible vessel narrowing, which could lead to vertigo. Meanwhile, I would recommend to discuss with her attending physician to make the proper changes to her actual antihypertensive therapy in order to have a better control of high blood pressure. I would also recommend taking aspirin 80mg, to prevent possible brain ischemia (which could be related to the vertigo and tingling face). Hope to have been helpful! Best wishes, Dr. Iliri