The rules states (Alpha p97):
"When you are broken (regardless by what kind of Misery), you cannot use any skill or perform any action. At most, you can crawl a few meters every turn and speak in barely coherent sentences. If you're broken by Fear, however, you can flee to a safe place if you can do so without rolling dice."
Regardless of you 'Cast Spell' or use a 'Power Word' it counts as an action.
“I’d say thistles, but nobody listens to me, anyway.” - Eeyore