You need blood flow to go to ur brain because not enough is going to the brain that's why u get dizzy. When u flex ur stomach, ur blood rushes to the outer parts of body like the head, away from the core.
So for example if u are standing up, and feel dizzy, lie down so that blood goes to ur brain. If u are getting up and feeling dizzy it's cuz U got up too fast and u need higher blood pressure
Have you eaten today ? That can cause light headedness. If you don't think you could eat, try drinking weak tea with sugar. Could be your sugar levels are low. If symptoms persist for 48 hours, go see your doctor!!
@DaveLiam788 how can doing this help me? i know why i am dizzy my blood pressure is around 80/50 aka 8/5, I just measured today and I crave salty and sweet stuff at once
When and what did you eat last? That sounds like low blood sugar and dehydration. Eat something and drink something, non alcoholic. Alcohol will,dehydrate you.