I deal with the same things... Constantly.
Everyday, all the time... I feel as if I can't catch a full breath of air, having chest pains, arm pains, back pains, IBS (the worst), Stomach pains, racing heart beat, visible pulse, dizziness.. You name it.. I've felt it. Anxiety is terrible.
But when I take a Xanax, or finally get the chance to relax. Most symptoms dissipate, although the rapid heart rate, usually doesn't.
When you pay attention to something, it'll happen.
When I was younger I used to question breathing.. So I'd sit there and actually try to breath deeper and deeper but couldn't catch a breath and would worry about it for a few minutes.. Forget all about it afterwards because breathing is natural, you can't force it.
Anything you focus on, can happen. Especially in your body. Your mind can trigger so many things at so many times.
A lot of anxiety is subconscious.
You ever wake up in the morning, off balance? Dizzy? Feeling like you can't breathe or with a racing pulse?
In the middle of the night when I wake up, my pulse starts trippin out.. Simply because I wake up thinking about problems. I can hardly sleep anymore either... I used to love it, now I dread it.
You'll be fine, stay positive and active. I'm 21, go to college 6 hours away from home.. My first panic attack was the night before a big exam.. I had to sit in an exam room with 200 ppl the next morning for three hours, thinking I was going to die, every minute of it.. Imagine that.