I know that when my wife (who has varying degrees of high blood pressure) feels a lot of stress, she gets flushed in the face, blood pumping faster, and gets headaches. Also, being a bit unsteady on her feet.
Lying down helps to lower the pressure, to some degree, depending on how bad one has it.
I’ve had periods of anxiety when my blood pressure would be very high. I could always tell because my upper arms would start to tingle. Then the sensation would grow until it felt like my arms were going to explode…just like when they take your blood pressure. My doctor said that was an unusual symptom, but that people often feel the pressure wherever they tend to carry tension. For me, it’s my arms.