The problem I have is that measuring causes panic about the expected result, which increases the blood pressure. Then if the result turns out to be very high, as expected, the panic increases and the next measurement turns out even higher.
Measure every hour. Or every ten minutes. Your hormonal system can't sustain the panic state for long, plus seeing high values and realizing that you are not dead yet will desensitize you to these high values.
As someone who's had both high blood pressure and excessive worrying — I second this advice.
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