I have suspected high blood pressure too.
everytime i went for check-up and nurses check my bp, it would always be above 130. The highest i measure is 150 something.
When doc give me MC to rest at home and monitor my bp, it was all fine.
and now, i went back to work, bp was rather high or border line. even early in the morning, mid noon or before bed-time, it was never below 125.
i wonder is the machine problem or my problem. When i first measure, it would always be very high like 140+ and when i measure the 2nd and 3rd time, it would be lower than 140+, like 128 to 135.