5 years ago my son was brought to his doctor a few times for the same reason , his issue went undiagnosed. I brought him in on a Friday and by the weekend he blew a oral temp of 105.8 , so rectally he must have been very near 107 . He wound up with what the nurse in the hospital called a massive pus pocket near/in his brain . It was a sinus infection that went horribly wrong. Infection went into his bloodstream ,his white cell count was crazy high at about 40,000 . Technically had a sepsis type (not really sure as it was not clearly defined)He now has issues , learning disabilities, memory issues ,fine motor skill issues,emotional, and a sensory hearing loss in moderate range and just got a hearing aid this past month . I believe that this illness caused a lot of damage to my son .