For the Doctors. Help My Hubby, Please?

My darling husband has been sick with a mystery illness that has his doctors stumped for the past six months.
  1. It began with blepharitis in July.
    This has been treated.
  2. Shortly thereafter he started to suffer from fatigue.
  3. Around this time he also started running low grade fevers.
  4. He also developed a rash on his cheeks, forehead, and nose.
  5. His doctor tested for Lyme and though my hubby showed some antibodies, he was told he's negative.
  6. He's also has thyroid, testosterone, and cortisol levels checked. All are fine.
  7. He eats an exemplary diet and is moderate in his habits.
  8. So, what do you doctors think?