The same thing used to happen to me. Mine was more so because I really don't like going to the doctor and was very nervous/anxious. If you are truly worried about this, I would advise investing in a low-cost blood pressure monitor that you can do at home (get the one with a cuff/not wrist or finger) and test it on your own periodically throughout the day and track your results. You could meet with your doctor again to discuss if you have concerns still. This is what I had to do, and actually went on a diuretic
to help maintain the right pressure. Since, I have changed my diet and no longer take medication.