Panic Attack

I try not to panic, I try not to scream, 

I try not to cry, but I cannot keep it under control.

I can feel my chest tighten for no reason. 

I can feel my throat dry up without any explanation. 

I feel like fainting and blacking out. 

I am scared, 

I am frighten,

I am freaking out. 

But  I don't know why or how to stop it.