rollo,
I would not medicate numbers like that. ESPECIALLY not if you are a marathon runner.
When your doctor gives you his next bill why not tell him "You don't BELIEVE in doctor's bills." (You might also ask him what his best marathon time is.

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Your doctor is a fool and should be fired. White Coat hypertension is a reality whether or not some doctor "believes it" or not. Medicine is not a faith-based system.
In fact, white coat doesn't even enter into the equation if you get 140/80 in the office...even the newest tightest guidlines will call that "prehypertension" (give or take a point.

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If you can run/walk/crawl 26.2 miles at age 44, you have no reason to worry about the condition of your heart. You have just [assed the ULTIMATE stress test with flying colors.
(Any antihypertensive will also crucify your best times!)