It appears that tonsillitis with a dry cough and irregular fever which worsens at night might be the issue at hand. Tonsillitis often brings about a throat ache and enlarged tonsils. The fever could be a result of an infection. It is advisable to take a lot of fluids and soft foods as well as resting. Gargling using warm salt water helps to reduce the pain in the throat. If the symptoms persist, visit a pulmonologist.