Have you ever gone to your doctor and your CBC showed elevated lymphocytes? If you do not know, lymphocytes are white blood cells in the immune system that fight off infections. Anyway, when they are raised that usually means a viral load, such as CMV, HHV-6, and EBV.
Now, these are nothing to fear, they can easily be treated. Your body is telling you it is run down, so you obviously need rest for starters. Then, the next step is Vitamin C and natural immune boosting supplements, such as Larch Arabinogalactan or Lauricidin, plus it contains anti-viral properties.
Your blood results should go back into range with this treatment course.