That would happen to me when the nurse would take my BP. When I finally complained to our (previous) doctor, he went ahead and took it himself. Voila! The nurse had not been supporting my lower arm, so she ended up with an inaccurate reading. After that, Doc always did two separate readings himself, one on each arm, about five minutes apart. He said that repeating the test would make my body relax and give him a better feel of how my BP was doing. I couldn't believe the difference.
, do you have a blood pressure monitor at home? Himself had to get one per doctor's orders so he could track it daily for a while. I always borrowed my SIL's when I needed to do that, but now I could use his. I was amazed and troubled at what getting angry with Himself did to my pressure the one time I thought I was going to blow my top - apparently literally! I remember the top reading was 255...that was all I needed to know!
Now when I get mad, I do deep breathing exercises and have a small piece of chocolate. Anger...gone!