Anchor in the Storm, Waves of Freedom Series by Sarah Sundin and published by Revell Books.
Lillian Avery is a pharmacist in Boston during the World War II era. Ensign Archer Vandenberg is best friends with Lilian's brother? She is annoyed with him when he starts paying attention to her. After he returns from his battles at sea to find his men struggling, the two begin to work together to see if there is a link between the Navy men who struggle with nerves and drowsiness and the large prescriptions for sedatives Lillian has filled? Will this new connection show Lillian she cares more for Ensign than she thinks?