Anguish

It's that strange feeling of foreboding
filling you after two sleepless nights..

When something painful suddenly fills you.
Not something surreal,
despite you don't know the source of it.

No.. something tearing your insides,
as if something's horribly wrong.
A strong sense of loss.

You try to locate the meaning of it,
willing it away,
as there's nothing wrong..
Nothing should be wrong.

Then why can't you strangely realize
what's causing this?
Why can't you make it go away?

Why is it so hard to understand
what could be behind this?