I am an active healthy 26 year old and have never had any issues with my health, other than the regular, but in the past month I have experienced some weekends where I have come close to fainting but have not yet actually fainted. I thought the first few times may have been hydration and not enough sleep due to having drinks with friends. But I have been told excuses like iron deficiency and so on, but recently I was fine again, for about a month, until this past weekend where it has happened again about 6 times in one day, i'm not sure what to expect from my doctor since I have no idea. I have recently been taking multivitamins for active women and exercising regularly so i'm not sure what the issue may be except not being able to get enough oxygen into my brain due to asthma. hopefully this site may help me out