Demon inside

There's a demon inside that grows in strength,
whenever a piece of me dies, it's insane
every time my eyes dry, comes more pain, cutting deeper than before, to the vein
I wake up from these dreams, in cold sweats with silent screams,
trying to wrap my head around what it means; all the while, this demon grows more vile, with every ounce of strength i
 try to fight and all he does is smile, and says no matter what you do will prove futile,
 the more you fight me the nightmares become more brutal.
these dark thoughts begin consuming me,
speaking  words with false promises within begin seducing me,
and foolishly i start losing sleep, trying to keep the nightmares from haunting me.