[KrazieLunaK]

i have experienced similar stuff like you
i would have nightmares and the pain i feel
from the nightmare itself would manifest it self
on my body, it has also happened while im
experiencing sleep paralysis... the first time it happened
i was scared out of my mind but now i know that the pain
isnt that real so i would wait it out till its gone.

but you should be careful with your sleep
i dont know what you do before you fall asleep but that
can affect your sleep...listen to some heavy metal music before
that could have triggered your nightmare (just an example)
i fell asleep after reading my text book and it it triggered one for me

i hope this helped to some extent