Hi there understand your concern... There are many conditions which present with fever...but most of them have been ruled out in your case as you have gone to clinician at early... It may be due to upper respiratory tract infection... Most of the time it will be viral it takes time to resolve...Do steam inhalation which will inhibit viral multiplication...Drink plenty of water,eat soft foods like cooked cereal, mashed potatoes, soft fruits, yogurt and soft-cooked eggs...give adequate rest to your body..Avoid spicy foods or acidic foods. Gargle with warm salt water. gargling several times a day can help relieve throat pain....Regards.