Today I went on a bike ride and it was like 30 degrees out !me and my brother rode really far but then I started to feel sick to the stomach , like I was going to throw up. As I was calling my brother my vision got red and blurry, then my hearing starting to sound weird. I stopes an I felt wobbly to the leg so I fell in to the grass but after 20 minutes everything went back to normal but now I can't walk without losing my breath. I'm scared what could it have been?

You most likely bonked: http://en.wikipedia.org/wiki/Hitting_the_wall

Better to visit your doctor if it continues.