Answer :
The word choice in the excerpt creates a tone of anxiety.
Juliet was anxious about when the nurse she sent on an errand will return. The nurse promised to return in half an hour but didn't. Juliet was thinking of the possibilities of why the nurse didn't return as promised.
The nurse has spent 3 hours between nine O'clock and 12 o'clock and she's yet to return.
Meaning of anxiety
This is an unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about something or someone. It is a state of restlessness and distress.
Therefore, the word choice in the excerpt creates a tone of anxiety.
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