I'm new here, but would still like to chip in.
First, I went through that thing of checking the BP all the time. I have panic attacks at the doctor's office (hence my moniker White Coat Syndrome), and so the doc would have me check it at home. I became a bit obsessed with it, checking it multiple times a day. Now, I just check it occasionally, like once or twice a week, and report that to the nurse when I go into the doctor's office, rather than having them take it and freaking out because it's really high.
Here's one thing that has helped me with the health concerns - exercise. I used to be a good exerciser, always hiking or bicycling, then about six years ago I slipped on a hike and injured my knee. One thing led to another and I spent the next 5+ years doing almost no exercise, was on Lexapro and gained quite a bit of weight. Several months ago I started exercising again, just indoor treadmill and recumbent bike, do one of these at least once a day for a total of about 40-50 minutes, started out slowly and have built up, and that made me realize that, if something were truly wrong with my cardiovascular system, it would show up during the exercise. I push it enough that I have sweat dripping on the treadmill or around the bike and breathe hard, but not enough to make me dizzy. I also drink water during the exercise so I don't get dizzy from dehydration, and I like to do intervals of slow, fast, slow, ....
So exercise has at least two benefits. First, it's good for your cardiovascular system, blood pressure, and so forth in the long term. Second, it gives you confidence that your body is not going to betray you. If you do fine during exercise, then it's extremely likely you're fine when not exercising.
Maybe you are already a big exerciser and this is redundant. If not, I hope this helps and hang in there.