Feeling Dizzy and Faint. Why?

I have that. It's orthostatic intolerance aka low blood sugar when standing. I bet you only took your blood pressure when sitting, right. What my doc told me to do is eat little sugary snacks like every 15-30 minutes throughout the day. It's SO annoying but it helps a lot. There's no meds you can take just bring a rice crispy wherever you go and eat it when you start feeling loopy