Maryrose I hope your blood pressure settles, if not you may need to take a blood pressure lowering medication.
I have been taking such a medication for at least ten years now, the same dose all this time, which kept it regular.
Recently I was checking it for a medication review but found I was having low readings. One evening I was feeling dizzy and faint so next morning I didn't take my medication as I knew I'd be on the floor if I did. Later in the day I spoke to my GP who prescribed a half dose of what I was taking.
I wondered what had caused this and the only thing I can think of is that I've not been eating any sugars for about a month, so am pleased if my theory is correct.
Old woman, I would recommend Omron blood pressure machine, it is very simple and easy to use. This brand is commonly used in GP surgeries, and is accurate as far as I'm aware.