Any ideas how to stop fear of blood pressure check?

I have had white coat syndrome many years. My actual blood pressure is ok but as soon as ANY cuff goes on my arm, my heart races. I'm afraid of it being high, which of course MAKES it high. It's self fulfilling prophecy. The root fear is that I should be thinner (Even though my blood pressure has always been ok).

My mom would ridicule that I should always catch everything that could possibly be wrong, health wise. It was oppressive and made me fear many things, especially blood pressure because I could have *prevented* it, if it were to be high. I really don't want to fear this anymore. I've even avoided going on doctor visits because I know they'll do blood pressure checks. I brought it up to my therapist but they don't help... many times they just nod. 😧 Any ideas to lessen the fear?