Hi relax .hb is also low. Without detailed case history difficult to find out cause. Fever
with chill is indication of sepsis in body.
Whatever maybe cause give following medicines. Pyrogen 200 4pills one dose only followed by bry 200 4pills 3 times daily for 3 days calsivita syrup 1spoonful 3 times daily ferrum phos 30x 4pills 3 times nat
sulph 6x 4pills 3 times daily for 8 days and revert back for further treatment.