6 year old with persistent fever, headaches, exhaustion but no other cold/flu symptoms. has normocytic anemia and hemoglobin of 106. what's the cause?

Worrysome: Persistent fever longer than 3 weeks is worrisome and requires a more vigorous search for the cause. You should seek consultation with a Infectious Disease(ID) consultant who will check into causes of Fever:Infections like TB, Malaria, Cancer or other inflammatory conditions. A spinal tap is indicated if the Headache is more than mild. The child should be in the hospital if the temp is >100 degree