The medical name for this is orthostatic hypotension, also known aspostural hypotension. When you rise from sitting or lying down, blood may not reach your brain fast enough. You might feel lightheaded or dizzy. The feeling should pass in a few minutes. If not, it could be a sign that ...
So I would advise all to get to know your body and then work to make it well. I know MY quality of life was GREATLY decreased when I was getting dizzy and feeling like I was going to pass out all the time OR to have the bloating and gas that others described. I wish the best ...