I twisted my ankle recently. It was really painful. For some time, my vision started getting blurry and I could hear a ringing noise. I'm fine now. I was just curious to why this happened. As a science student, I've come up with all sorts of theories. I think much blood rushed to my ankle so that there wasn't enough for my brain. Tried googling but didn't find the answer. I decided to get help from the experts. You're probably laughing your ass off at my theory. I know.