Passing out on period question?

When I was 12 I was sitting in a small room with about 8 other ppl and I think I passed out cause I opened my eyes and I was hunched over. I don't remember that very well. About two months ago my parents made me go to a therapist for stuff so that therapist put me on zoloft. Then a month ago I had to get blood drawn to see if i had any thyroid problems and other stuff. I have a vitamin D deficiency Ya ya ik go outside and get some sun blah blah blah grrrrr.... anyways i now am taking vitamin D gummies.. hehe. Oh and after getting blood drawn I passed out ( I didn't even look at any blood!). so two days ago my period started ( not my first period ) I was having bad cramps and I was really sweaty so I layed down for a while I got bored just lieing there ( i was laying down because I kinda felt like I was gonna pass out ) so I tried getting up slowly but I passed out. Sometimes during my period I get bad cramps and throw up but never pass out. I'm 14 about 129 lbs. I eat food! yaya me for eating. sry just had to say that. i like eating eating is a good thing :). anyways um I don't really exercise much but sometimes I do dance crazily. sry about this being kinda weird I just thought this up and I wrote down pretty much what I was thinking.