Heart/Chest/Stomach Pain? What is it?

I've been having a little trouble with my body lately... could someone help me? I haven't been to the doctors office yet because I'm not sure if it's anything at all.

Just today morning the right side of my chest began aching, and then spears of pain just shot through for a few seconds. Last night I experienced some unexpected stomach pain before eating. In the mornings, sometimes my heart makes a strange whooshing sound, like a deep rumble, and it's a little hard to breathe when it happens.

What is this?? It's not like anything I've heard about before... can anyone help me?

I'm a pretty young girl, maybe it's a growing thing?

Thanks so much in advance!