Medical Mystery- Just For Fun?

I think these are really fun so I've come up with a fictitious character, we'll call him Patient A, and he has an illness. You get 5 questions to ask me, but I will give you information in the description.

Twenty-two year old caucasian male is brought into the hospital via ambulance after calling 911 complaining of sever fever, shivering, flu-like symptoms and joint pain. He is brought in with his friend, a twenty-three year old african american female. The friend explains that they returned from a semester-long trip overseas for their International Studies Program around a week ago. They were in several locations including England, France, Spain, China, Vietnam and several sub-Saharan regions.

Other symptoms:

Anemia

After being admitted:

-Nausea

-Extremely lethargic

-General feeling of malaise

-Headaches

Hints:

-Family history of heart disease, breast cancer and diabetes

-No other students on the trip are complaining of other symptoms

-He and the friend he came in with spent the entire trip together

-Was born in Germany and moved to the US several years ago

In order to win, you need:

A diagnosis

A test to confirm

A treatment or cure

Remember: If you have questions I will answer them. But you only get 5 as a team, so make them count.