I went and got that checked out when I was having that issue. Its called syncophy or something like that. Well its caused by the low circulation of blood to your brain. Its nothing bad it just means you have to watch how fast you get up.
Sometimes it when u lay down or sit fir a ling time and rest your head on lije wood or another hard material it causes uncomfortable and when you stand up your head insides feel like there swirling around
inner ear infection?
Do you have low blood sugar? That happens to me when I don't eat on a regular basis and my sugar drops.