<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having some trouble lately. Ive been having nightmares and Ive been using drugs a bit more frequently than usual.  <response>: Those could be symptoms of many things, but given your history, I am concerned you may be infected with the human immunodeficiency virus HIV. We will need to perform some tests to determine if that is the case. 