For the fourth time in the past two months, i was just hanging out when all of a sudden i started getting a really heavy feeling in my head and everything started going black and it looked like a veiny-like structure everywhere I looked, almost as if I got up way too fast from sitting somewhere low. If I can’t find something near by to lean on or someone to help me to that object I fall & need a minute before I can gather my senses and find myself Again. What is this? *headaches too