For white coat syndrome, go to boots and get a good quality home monitor.
I have to have a medical every year for work, used to get problems due to the uncomfortable feeling of the squeezing which led to worry about the feeling and result etc etc when I was totally fit and heathy. I just got under he numbers to pass my medical.
Now I do a test every Monday at home, not to monitor the numbers, to familiarise myself with he feeling. Medical Now no problem.
This will allow you & the doc to find out the actual number and take appropriate action if required.
Good luck,pal.