Hello. I'm sixteen. I'm a runner. Started at 13 Cross Country and Track. I guess since i was 12 i've been having blackout spells. I would stand up and my vision shrink, kind of like tunnel vision. a lot like tunnel vision. i would have to stand up straight cause i get dizzy and loose my balance. It also happens when i walk into a different room. I'd walk from the living room to the kitchen and just as i get to the doorway i loose my vision and loose my balance getting dizzy. I have fainted once. outside doing yard work. my finger got caught between two small rocks and it took me a while to faint. My blood pressures good. My iron levels are relativley ok. they're not the best but they're within a healthy range. These blackouts would happen around 5-10 times a year. Any ideas. those are my only symptoms. when i was 15 i just started getting regular head aches and i cant hang my head cause it feels to heavy that it hurts. it doesnt feel like there is any liquid in my head, its just really heavy. Any ideas or suggestions?