Hearing my own Breathe and Chest Pain

Hi all!
I'm still in high school, and I'm concerned about my breathing, I've been hearing my own breathing when I dance. Whether my mouth is open or not. It sounds like I'm taking a really deep breathe, but its not like I can imitate the same sound as the one I hear in my ear. This happens only when I dance through my hips, in Cha Cha for one, where I have to constantly switch my hips where one hip is forward where the other is in the back.

My other concern is about my chest, where sometimes I feel a painful feeling in my heart. Its hard to describe, because it doesn't quite feel like a poke nor a squeeze, maybe something in between? I've been getting it since I was young. The first time being around the age of 7 perhaps. It didn't occur to the point where it was every week, maybe about every few months. And I it comes spontaneous. It hurts for a few seconds then stops. When it occurs, I kind of stop in place, afraid that it would hurt if I move, and I think that it does hurt when I move.

I've been trying to look for answers online, but I'm still worried. I feel as if I have some of the symptoms of one disease, then some of another. I haven't found one where I have ALL of the symptoms. As for the breathing, I thinking there might be something wrong with my Eustachian tube, and about my chest pain, I was thinking my heart is becoming larger. I forgot what that disease was called, but it was a recent new disease that was hard to diagnose or something of the sort.

I hope someone knows what I'm talking about > < I'm really worried about my body, especially since I'm a dancer.