I'm a 26 year old female, I have been smoking weed regularly for 5 years or so and in that time I have fainted 3 times. 2 of the times were are an outside music concert 1 year apart. I only smoked a little joint, less than I usually smoke and 15 minutes later I fainted and fell to the flore for a couple seconds to a minute. In that time it felt like i was in a fast past dream or something. I though that was a weird reaction to something and maybe i haden't eaten before, but the same exact thing happened a year later. The concert had bright flashing phsycadelic lighting going on and the sound was loud, it felt kind of like a sensory overlaod??? Other than that, i'm a healthy person, eat well, exercise, sleep lots, don't take any other drugs. I am on the pill and do take over the counter pills for pollen allergies in summer. These concerts where in summer. The 3rd time I fainted was after smoking a joint after a while in the sun, i didn't actually faint but my vision became technycolored (oversturated with bright bright colors), lost my balance and had to sit for a while.
Do you have any idea what is causing this, please help.