The 96-year-old client is receiving digoxin and furosemide. In the morning, the client reports having a headache and feeling nauseated. What should the nurse do first?

Contact the client's primary health care provider immediately.

Check the client's laboratory values and vital signs.

Administer acetaminophen and aluminium hydroxide/magnesium hydroxide.

Give the client clear liquids and have the client lie down.