question: I am 19 years old and have had a low grade fever (nothing over 100.0) for 6 weeks.  I have been extremely fatigued and have had abdominal pain as well.  I went to a doctor who tested me for mono, autoimmune disease, blood clots, blood infections, and malaria (this illness began 2 weeks after i returned from Dominican Republic).  All of the tests came back normal.  I am at a loss and so is my doctor...I need an answer!