BP tests at the doctor's office are mostly worthless if they're causing you anxiety BEFORE they're ever done! White Coat Hypertension is the name they've given it, and now some MD's give you the malarkey that it's even more dangerous than regular hypertension. Sure, anything to get you set up on meds you don't need.
I have pins and a plate in my left arm. I request they use my right arm, to avoid causing me major pain, but even that minor confrontation with nurses who don't want to accommodate me, raises my bp. Then, I ask that they don't exceed 160 on the inflation, as my veins are, for a fact, easily bruised when they pump me up way beyond that. The whole thing is laughable: They tell me my bp, I tell them it's a joke
My old doctor, a guy my age who was cool, had the intelligence to take my blood pressure, himself, after the nurse irritated me. The reading was usually 110/65. Now, I leave the doctor's office with my 125/85, come back home, put on my cuff, and get the old 110/65, or thereabouts.
I avoid doctors as much as possible. If you're not sick when you go for a visit, they'll find something wrong, to make sure they can run tests and make more money off of you and your insurance. I view them the same way I do auto mechanics: Both deal with captive audiences. Both go for the bucks!