Diane, I'm sorry you're dealing with stress problems and BP. But glad to see SOOO many great suggestions (especially around playing with our pets!! It's something that has always helped me too!).
I grew up thinking BP problems were hereditary -- my Dad struggled to control his using meds. When I was grinding my teeth and battling high stress at work,( in the form of supervisors who I think felt deeply threatened by women in the workplace), I was put on medications, and I hated how they affected my approach to life. I think that in itself stressed me too!
I eventually got fed up when I was planning a vacation and my meds were going to run out mid-trip, and when I tried to get a refill I was refused. I resolved to figure out what was really going to address my health issues, and wound up finding a clinical nutritionist who practiced homeopathy. Working with this woman, I learned that a lot of the BP problem was from my (supposedly healthy) diet. My body was reacting to some of the foods I ate by upping my heart rate and constricting blood vessels and so on. I changed how I ate a lot. And my readings normalized, enough that I was able to get off of the medications (and also amazed my young MD!) I had always had "white coat" issues, too.
I'm not saying this dissolved all of my stress. But it sure did make a real difference for me, in how I felt about life and stress. I definitely agree with all of the other strategies here. And whatever gets you real, genuine rest and erasure of the actual stressors, even briefly, is important to use.
I think also that folks like me (and you) who go full-tilt and then drop from exhaustion, we need to school ourselves sometimes, rely on the loving advice of our DHs and such, and take breaks from the GOOD things, as well as from the bad stressors. That's probably where practices like meditation help, in allowing "good enough" to be good enough. Oh, and NOT letting the "wasting time" thoughts to win.
I'm gonna add lots of the previously-mentioned strategies to my bag of tricks, too!!