Hi thanks for your question.
Your hypertensive and you had two episodes of dizziness
The most common cause of dizziness in hypertensive individual is either increase in blood pressure to a very high level or fall in blood pressure to a very low level from a level at which blood pressure is maintained in hypertensive patient keep a close watch on your blood pressure.
There might be a fall or too much rise of blood pressure at time when you had an episode of dizziness.
Hope i answered your question