You are likely to get a high reading at the surgery because of the "White Coat Syndrome"particularly if you have driven there, are anxious about something.
A reading immediately after climbing stairs will be higher and show a high pulse rate, unless you are extremely fit.
BP needs to be taken under standard conditions.
You should not compare waking figures with those just after running or digging the garden!
A diary usually specifies on waking and when in bed after a short period of resting. At the end of the week the figures are averaged, so despite an isolated 152 / 81, the average might be 143 / 74 with a heart rate of 64.
The factors affecting the readings need to be taken into account when looking at the readings.
The difference between the lower, diastolic, pressure and the higher systolic is important.
When the heart is not pumping, but drawing in blood, the pressure should decay (fall). If the arteries are obstructed the pressure falls more slowly, so the difference is smaller, and the systolic is likely to be higher.
So 140 over 75 is good. The pressure is not high because the arteries are clear, and the pressure drops to a low figure
(Think of trying to pump up a bicycle tyre with a puncture)
If Systolic and Diastolic are both high, the arteries are likely to be obstructed, . The heart is trying to force blood through a partially blocked pipe. When it is not pumping the blood cannot drain away easily, so the pressure remains high.
So 180 over 100 is bad.
If the heart is strong, and the arteries are clear the Systolic may be high but the Diastolic will be low.
150 over 75 would be good A powerful pump delivering into an unrestricted pipe.
The heart rate also influences the readings. A slow beating heart, say 65 per minute might produce the 150 / 75 figure, but a heart racing at 90 beats per minute would produce high readings, because there is less time for the pressure to drop before the heart pumps again.
A low pressures and a high pulse rate suggest that the heart is small or not pumping well .
Medication can influence readings, as can the build of the body. Someone weighing 7 stone is unlikely to have a big powerful heart. Similarly, an overweight 5 footer would produce high readings, worthy of further attention.
Too strong a dose of Beta blockers can slow the heart and cause low pressures, so that you see stars or feel dizzy.
Not a doctor, purely seen from an engineering perspective.