I think one of the best books I ever read was called "The K Factor" by Richard Moore and George Webb. I got it about 20 years ago in paperback.
You can still get it new or used at Amazon.
Basically what it says is hypertension is unknown in primitive societies.
By studying their diets the "K" or potassium ratio to sodium in their food is about 4:1.
In modern societies that ratio has reversed to 1:4!
Salt is added to almost all prepared foods and most people add even more.
In order to get the ratio back in line throw out the salt shaker and avoid really high doses of sodium. Check the labels. You will never be able to eliminate it but you can cut down.
Load up on high potassium stuff to get your "K" ratio higher. Eat lots of bananas, fresh fruit and vegetables. I prefer Ruby Red Grapefruit Juice not from concentrate every day but orange or other juices would do. Don't get added sugar ones.
I eat lots of natural no salt added chunky peanut butter. Almonds would work but don't get the salted flavoured kind.
Prunes are excellent!
Enjoy a few chunks of high cocoa dark chocolate frequently.
Not milk chocolate!
Alcohol can be good but don't drink every day. It can and will raise blood pressure. Probably no more than 8 a week and never more than 2 at a time.
Get a Blood Pressure Monitor and check yourself periodically. I'm consistantly ~ or below 120/70. I've kept a good weight all my life. Extra pounds could be a BP problem. Do some kind of strenuous exercise every day. Walk/run or weights.
And finally ER can work wonders.
I was a teacher and remember what it was like trying to contain a room of 35 hormonally charged Grade 8's. You could have stress but the key was to never show it!