I think I'm going to implode, or hyperventilate. What does having a panic attack feel like?

One of my... "friends" (I guess. He's in my drama class and i talk with him on the bus most afternoons) has been having dreams about people's personal "hells on earth".
One of those people was me.
And it was uncannily accurate. It's a nightmare I would have had, if I were a normal person.

This is really freaking me out. He doesn't know me well enough to have guessed it on his own, and I'm pretty sure I've never told him, either. I don't know him well enough.

AAAHHHH!!!!!! This is super freaky.