I was on the brink of sleep.
I could feel myself just kind of drifting away.
Then I saw some doors, and a man.
He stopped, stared at me.
And then walked quickly on his way.
He was more like a shadow then a man.
It only lasted a couple seconds.
But I woke with a jolt, and was just SO scared.
More scared than I've ever woken up from a dream.

Help, please?

This is a common type of hypnagogic hallucination, a hallucination that you have as you are falling asleep, halfway between being asleep and being awake. (A hypnompic hallucination is a situation that you have when you are waking up.)

It's common to hallucinate a scary figure during a hypnopompic hallucination, and to have a feeling of intense fear.

People experience similar hallucinations during sleep paralysis.