I had sudden high blood pressure and dizziness.  My blood pressure is controlled with hypertension medicine and it is usually 130 over 80 or 120 or 70 but it spiked up to 160 over 96.  Now is it down to 146 after lying down for 15 minutes.  The dizziness lasted quite awhile.
Hello! Thank you for asking on Chat Doctor! I read your question carefully and understand your concern. It is necessary to perform a comprehensive differential diagnosis between different disorders related to your symptomatology. The main disorders to take into consideration as possible responsible for this clinical scenario would be an inner ear disorder and a transient ischemic attack (TIA) in the vertebra basilar system. I recommend consulting with your GP for a careful physical examination, a resting ECG and some blood lab tests (complete blood count, thyroid hormone levels, kidney and liver function tests, blood electrolytes, fasting glucose etc.). A Doppler ultrasound of the cervical vessels would be necessary to examine the blood flow to the brain. If all the above tests result normal, I recommend consulting with the ENT specialist for a physical examination and labyrinthine tests to rule in/out any possible inner ear disorder. Meanwhile, I recommend to carefully monitor your blood pressure and avoid straining physical activity. Hope to have been helpful! Best regards, 