BP measurement would appear to be more of an art than a science, IMHO (I am not a medical expert).
I have been on BP medication for 22 years, and, attend Doctors annually, to have it "reviewed".
As
@Pale Rider said above, the review only ever seems to suggest increasing the dose, or, adding more medication.
I do not like taking medication, unless absolutely essential (have you ever read the leaflet inside every box, with the list of side effects?, enough to scare you to death!).
After a couple of such reviews, I dug my toes in and disputed the suggested increases.
The result, my GP sent me on a course of exercise activities (walking, cycling, swimming).
Results were:
a) I returned to regular cycling after "falling by the wayside"
b) I lost a 14lb in weight
c) BP stabilised without increasing medication (although, I do still take the same dose I was taking 20 years ago)
d) I monitor my own BP, at home, taking several readings which I record in a spreadsheet
e) When I visit GP, for annual review, he uses my spreadsheet.
Good luck.
PS, I do self medicate with regular Red Wine intake
72 and still here.