NaPoWriMo Day 27 - "Beat of my Heart"

The NaPoWriMo website has been down and the Day 27 prompt hasn't updated properly as far as I can tell, so I'm having to go by what's on Twitter:

...get in touch with some minor, haunting feelings

With little to go on I've interpreted this as best I can, so here's today's poem and I hope it provides a haunting feeling:

The beat of my heart
The beat of my heart

Am I being watched?
I just can't tell
But up in my head
Rings a warning bell
With the beat of my heart
The beat of my heart

There's something thre
That I just can't see
Rooted in place
But it wants to be free
With the beat of my heart
The beat of my heart

A shiver running
Along my spine
Something's calling
That's hard to decline
To the beat of my heart
The beat of my heart

A passing feeling
Dark and bereft
Then it falls away
And all that's left
Is the beat of my heart
The beat of my heart