Hello,
Welcome to the HCM.
Dear first of all I would like to ask that why do you feel that it can be because of
throat infection..Has he symptoms of pain in throat or signs of inflamation in throat.
As the causes of swinging fever can be malaria,
Tuberculosis,any bacterial infection ,
urinary tract infection .But as he has history of headache at the back of head and
abdominal pain ,he might be having spreading of infection through different parts of body like menigitis (brain infection) etc.
I would suggest that get full blood count with malarial parasite,x-ray chest,stool test ,urine test done first.He may require
lumbar puncture test but after discussing with his treating doctor.Since it might be bacterial infection ,so he may needs prompt consultation from paediatrician and examined thoroughly and course of antibiotics for 1 to 2 weeks accordingly.
Hopefully my answer will be helpfull.
Regards,Dr.Maheshwari