If I stand up after lying or sitting for a while, I get lightheaded almost to the point of falling over, and my vision like goes black on the bottom half
that happens to me a lot too. its because of the blood flowing quickly suddenly i believe. having an iron deficiency makes it way worse, i have that and actually passed out once
been on the Google and i just now in the last ten minutes realized what "Visual Snow" is and that apparently not everyone has that. my entire worldview is shattered