I had an actual phobia of the blood pressure machine and all of my readings were sky high. I’d be nervous the first time taking it, then see high readings, start to panic, take it again and it would be even higher...

I ended up getting a bp machine that connected to an app on my phone and recorded my readings. I didn’t even look at the readings. Took a few days of taking it and not looking at it before I started to feel more calm. Checked them after a few weeks and averaged them.

You could also get something that monitors your pulse and not look at the reading unless your pulse is under 90 bpm (or whatever anxiety elevates your pulse to).