i used to get really dizzy and not be able to see properly, everything would just jumble together and the lights were funny, but i would never faint. it happened to me a few times a week for a couple months, then it just went away, i havent had that feeling for 4 months now....so i guess im good? i went to my doctor about it, and they were no help whatsoever, they said it was probably nothing, and told me to come back if it continued....i have a crappy doctor.
also my boyfriend gets really dizzy all the time when he stands up from sitting or something like that, he gets so dizzy he will fall over. he usually stands up, says "uhoh" and then i run to catch him. hes been to the doctor as well and i think its because his blood pressure is really low.