Hello, Earlier today i was at the gym and started to feel dizzy and my vision was a bit off. I went and sat outside and got some fresh air and i was fine. This is not the first time this has happened to me either, this happened once after an MMA class on my first lesson, and it has also happened a few times from smoking marijuana, One time actually envolving me passing out in a shop, i used to smoke marijuana pretty much daily but have recently quit, i had never smoked when it happened the first time. I do not smoke anymore and am relatively healthy, but i am still wondering why i get these sudden attacks of dizziness and nausea. anybody got any ideas?