My blood pressure is usually at 80 / 65 (measured using an automated bp monitor) with pulse 75 - 80.
I'm 5'2' and weigh 110lbs.
I don't experience any giddy spells or any discomfort, until just a feel days ago.
I was doing the dishes after dinner and all of a sudden, I felt my surroundings going dark and had to sit down and close my eyes. At the same time, I was feeling nausious. The feeling lasted for about 15 mins and then I was ok after that. My blood pressure measured 85/55 the next morning.
Is my blood pressure too low? What could be the problems of having very low blood pressure? What is my optimal blood pressure?
I monitor my bp regularly because I have a family history of hpt.

Thanks for the advice.