High Blood Pressure and Running

I have a question for the brains trust.

Can anyone tell me why I am a healthy weight, don't smoke, minimal alcohol, vegetarian, salt nazi, run marathons and ultras, but I have had high blood pressure for 10 years, and despite my lifestyle, and taking irbesartan the blood pressure keeps going up.

No doctor knows. I suspect genetics.

Any other thoughts?

I couldn't think of any other group on Reddit that would know the answer.