Yesterday I was at a festival with some friends and I fainted. I didn't actually loose conscious but I wasn't hearing very well, I couldn't see well, and I had all those symptoms that you get before you actually fall down. I sat down before it happened and after being very nauseous and eating sugar, I felt OK. A bit weak, but OK.
This is not the first time this has happened to me. Yesterday was a very hot day, I hadn't slept very well, and had two beers at the festival. The other times I had this feeling were when I hadn't eaten for long, or when I was under the sun for too long, too many people around, etc.

This doesn't happen often but it's pretty scary when it does.My question is: Should I look into this or am I just one of those people who faint easily? When should one seek medical attention?