Regular fainting spells, feeling tired most of the time and no energy l. What's going on?

Anonymous
In the pat year I've fainted once (I was taken to a&e due to very low blood pressure) and almost fainted on 4 other occasions. One being during a fitness class at the gym and another when I was waiting in line at a store. They come on suddently I feel very warm, sweat loads, turn pale, get shaky and have spotting on my vision. I usually sit down for a while and am then okay. Along with these regular almost fainting spells I feel very tired despite getting enough sleep, feel like I have no energy, head feels foggy and I sometimes get headaches. I'm twenty years old and before any one asks I do have a doctors appointment but thought I'd ask the question so I can somewhat prepare myself for possibilities of what it could be. Thank you.
Regular fainting spells, feeling tired most of the time and no energy l. What's going on?
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