ok im 16 and im healthy as far as i know. I do track ad my season ended maybe 2 months ago. All during tack season i was fine and i never had and dizzy spells or blurry vision. now im doing a speed camp and i cant even do a full sprint without feeling like im going to pass out. i get a bad headache and my vision gets really fuzzy sometimes it goes black. i cant understand why im feeling this way sense i drink plenty of water before and after practice i also eat properly. i had a cold 2 weeks ago but i think im over it i only have problems with my nose now which is always congested....Help!!