It is 2:00 PM and a patient who has been NPO since 12:00 AM…

It is 2:00 PM and a patient who has been NPO since 12:00 AM for a bronchoscopy is complaining of a headache and shakiness and is extremely irritable. Vital signs are within normal limits, and a one touch glucose reads 70 mg/dL. Which action is most important for the nurse to take?