Final answer:
The student is most likely suffering from posttraumatic stress disorder (PTSD).
Step-by-step explanation:
The student is most likely suffering from posttraumatic stress disorder (PTSD). PTSD is an anxiety disorder that can occur after experiencing a traumatic event, such as losing all possessions in a severe storm. Symptoms of PTSD can include difficulty sleeping, recurrent nightmares, and loss of appetite, all of which the student is experiencing. PTSD can greatly impact a person's daily functioning and quality of life.