Is my anemia getting worse or is it something else?

I was diagnose with anemia a few months, I am 16.
I have been taking iron tablets, but the other day i was in class and got really dizzy, i left the room and the teacher came out, tried to keep me talking and kept telling me to breathe. It's almost like my body wanted to pass out but i was fighting it, if that makes sense. I was shaking uncontrollably, and was starting to hyperventilate. I was finding it very hard to breathe, my face and arms went numb and i was struggling to talk. at that stage i was laying down with my feet up on a chair, the next thing i know there's 2 teachers running towards me, when they got to me they had their hands around my wrists trying to find my pulse, they struggled to find it. I couldn't keep my eyes open, and my face went as white as a ghost.
I don't remember much of what happened, but what i do remember, it's not very clear in my mind.
I'm really scared it'll happen again, do you think anemia is getting worse?
Also is there anything i can do if that happens again?