Yah I’ve encountered that too with the same issue. Sure, it’s normal for that to happen OCCASIONALLY for a few seconds when you stand up VERY FAST. It is not normal for it to be a frequent occurrence or for it to last more than a few seconds. I was diagnosed with anemia and pots. Hopefully things get better for you.
Yeah at this point I’ve learned to just stand up and stand still if I don’t know the path I’m taking, otherwise I just go blind and brace on the wall and after I’m completely still for a few seconds I can usually at least regain my vision and after a few minutes the dizzy will return to normal levels