Pruritus.

Itchiness.

There should be a special term

for mental itchiness.

Not severe

Not disturbing

Not panicky

Not agitated

Just itchiness

Gentle disquietude

Anti-placidity

Like that spot

between your shoulder blades

that you can never quite reach.

Itchiness

Unrelieved by books,

music, movies.

Prickling at that

fold in your brain

that won't be distracted.

Psychopruritus.

That should be the word.

Just try

not to scratch.