High Blood Pressure at the Doctor's Office

I do my cuff BP/pulse/blood sugars every morning. I don’t think the cuff is very accurate as it jumps all over the place but if it is very high, I try to stay still for awhile and usually it goes down.

Today blood sugar was sky high. I couldn’t figure out why thinking about everything I ate yesterday but nothing unusual. I worried for an hour and took it again (nothing eaten in that hour) and it was back to normal. I’m wondering if the battery is low, but there is no light indicating that.

This medical routine is going to kill me.