Hi there JustHuman,
You sound just like me a few years ago when I found out I had high bp. I was always fit and healthy and this really put me in a spin. It got so bad I started having chest pains at night, etc. It might have just been my fear.
Anyway, I think the berry the gentleman is talking about is hawthorne. A lot of people have had good results using hawthorne. It's pretty safe if you don't overdo it and it can't hurt to try it.
But I have a word of caution regarding all herbal and supplement remedies. I tried them all with no luck. It seems like they always work for some people but not for others. A few people start raving about something and then everyone rushes in to try it and most are disappointed. Still, can't hurt to try as long as it's safe (though most are way overpriced!).
What worked for me is slow breathing with music. I use something called the Breatheasy method that uses real music and guided breathing. This is something that works consistently for just about anyone who tries it properly and it's totally safe and even enjoyable. And it's got a lot of clinical support too. 15 minutes a day is all it takes.
You can get free instructions along with an online audio demo at:
http://www.control-your-blood-pressure.com
/demo.html
Give it a try. It worked wonders for me and I stopped worrying about heart attacks long ago now. Best wishes...