Seems I'm outvoted, even though I agree with your first doctor (what would make the second doctor more right, by the way?).
I posted an article (from the AHA site?) some months ago about office BP readings, and the fact that they frequently lacked real accuracy to patients' non-office pressure.
If you want to know what your blood pressure really is, get a good BP machine and check it at home, at least twice a day, from these five times, alternating between them as far as is practical. Early morning, mid-morning, noon, early afternoon, evening. Do it for at least a couple of weeks, preferrably a month.
If you want your cardiologist to know what your BP really is, ask to have an ambulatory BP monitor put on your arm for 24 hours.
I don't know how anyone would think that most patients who have recently had OHS would go to a cardiologist's office and present a blood pressure that is normal for them. Most of us are hyper, concerned that they'll find something wrong with their ceaseless prodding.
My cardiologist wanted to put me on BP medications because my office pressures were high (higher than yours, by the way, on both sides of the slash). I persuaded him to put an ambulatory BP monitor on me for 24 hours. Result? BP normal all day and night - except when I went to his office. Conclusion? Cardiologists cause high blood pressure.
No further medications offered. How many other people who are already taking medications might not really need blood pressure prescriptions?
There is nothing wrong with being sure before you start ingesting prescription drugs, nor should a doctor object to taking a few days to be sure of his diagnosis. Your BP is not so outrageous as to cause damage in a few days, even if it is not a result of white coat syndrome. If you are moved to act now, it would be reasonable to ask for a 24-hour ambulatory BP monitor for your peace of mind.
Knowledge is power,