Blood pressure. Can you control yours with a thought?

I was reading the responses to salt in your diet and blood pressure came up. I can control mine over a 15 range and have lowered it dramatically during shock treatment (not electro shock) after an accident. Say what? Okay, supposedly only monks, Hindu priests and other highly tuned to their body individuals can do this but surely not everyday man and woman. Not so. It's a trained response.

I read Dune by Frank Herbert at a young age and the Bein Gesserit mantras for reducing pain, fear and so forth made a certain sense. Take control through training. I tried various calming regimens and noticed that there was a difference. Once after a bad cycle accident and the EM staff told me my BP was way too high, I did the calming and made them recheck. They were amazed but wrote it off as a fluke. After my heart attack and I was being checked regularly, if it was too high or too low, I'd ask for a minute and then told them to recheck. The nurses always found it hard to believe and one time there were five nurses in the room observing just to see it happen as they had never seen control of BP before.

The only way I can describe how it works is an internal tightening or relaxing of my cardio system. I'm wondering if anyone else has managed to do this. I always hate being the only weird one. I'm still working on the levitation trick but to this day, no luck and the Madame isn't giving up her secrets.