Hi Tabitha, Welcome to HealthcareMagic Forum.
You should be taking your Son at the earliest to a Pediatrician
and get him examined to rule out any Infection. He needs a Complete Blood Work up along with Urine Routine to support the Diagnosis. His Symptoms suggest either Meningitis
, Gastrointestinal Tract Infection or Sinusitis. Since he has Nosebleeds which is common in children during summer season as they Play out in sun, get a Second Opinion
from a ENT Specialist
, it is called Epistaxis.
I Wish him Good Health, Good Luck.