since around July, I've been getting severe chest pains, sort of like someone has my heart in the fist and are squeezing it as they can, like twisting it, and like a grater behind my ribs, feeling like its grinding the center of my ribcage.
sometimes it in the center of my chest, like someone stabbed me and pulled the knife out and are pulling apart the sides of the wound.
my breathing gets all mixed up, and i choke a lot, with like severe dizziness.
it happens like 1-3 times a week.

any idea what it could be?
I am almost sixteen in two weeks, and i have normal weight and height.