For the past 6 hours I've been feeling a painful tightness in my lungs/chest and the base of my throat. It hurts when I breathe, and especially when I cough or swallow. (Worsens slightly when I lay down.)
I'm a 17 year-old female at average weight; I'm never around people who smoke and neither do I. I don't suffer from anxiety either. (And I don't THINK it's heartburn...)

I was wondering if anyone is suffering the same problems/know the cause of this?