Hellooo first post,

to preface, when I was younger (13-16) I got many piercings, got a couple tattoos, had Bloodwork and vaccinations and stuff. never had an issue. at 16 I got my septum pierced, and about 30 seconds later I hit the floor. when I turned 18, I got an std test due to.. circumstances.. and I passed out and hit the floor. suddenly I'm scared of needles. just beginning of this year(23yo) I got my Bloodwork taken again for a different reason, and I warned them beforehand. I stayed seated, on the fourth vial or so I said hey everything is going dark, then, I hit the floor. she stopped me from losing conscious this time by wiping my nose with alcohol pad. My question is, what could cause this? I'm not afraid or queasy of blood, I feel fine going into it. I'm apparently normal with iron and blood pressure. I have to get my blood drawn again, but now I'm scared to death of it. any ideas??? the last time I made sure to eat and be hydrated going into it as well.

edit; USA, 23, 5'7" Caucasian amab 125-130lbs, no drug usage, no medications, generally healthy I thought.