Mine goes the other way. It bottoms out within a few minutes, then climbs back to a reasonable pressure over 3 or 4 hours. I was told that the lowest bp that will support life is 90/60. Yesterday it fell to 85/43. I'm still here. Crazy!

I have had high bp issues since I was 40. When I moved to South Carolina 7 years ago, it really went wonky. My doctor added meds and it would calm down only to shoot up again. The last time I ended up in the hospital 🙄. Then I was diagnosed with Parkinson's. I am currently on 3 bp medications and my Carbadopa/Levadopa which usually lowers bp. Now I run around 150+/80 to 90+. Depending on my pain level that can go up from there.
The key is to pick 4xs a day that you check with a GOOD arm bp cuff. Log your findings and share with your doctors.
DO NOT IGNORE THE IMPORTANCE OF THIS ISSUE!!!

Welcome to pd if you're on blood pressure meds talk to your medical doctor about adjustments