I have always showed raised BP at medicals since I was 16 (diving then flying). Eventually my aeromedical examiner wanted me to go to my doctor to check if I actually have hypertension. The upshot was I was grounded after being diagnosed and put on medication by my local doc.
The CAA asked me to go to an approved cardiologist, he ran tests and stated in his report to the CAA that in his opinion I do not have hypertension and just get nervous. I now record my BP at home for say a month before the medical and bring it in to show my aeromedical examiner. My medical is based mainly on these home readings now. I am a commercial pilot btw.
I have found there is a strong link between my heart rate and blood pressure. Resting I have a pulse 50-60 bpm; almost every time the docs record around 120 bpm for me.