Fever 105 degrees. 5 hrs it again comes.

My son 3 1/2 years old has been suffering from fever since Saturday early morning...we gave him p -120..when temperature was nearly 105 and didn't go down below 102.on Sunday we took him to hospital ..during then,there was no doctor and nurse gave him an injection and some syrups..Next day we took him to show to doctor .. Doctor advised to continue same medicines and did some blood tests..the results were all negative..But there is no improvement in his condition...A lot of fever and nose blockage couldn't breath too...Then doctor changed fever syrup to Meftal-p...which when used decreases fever then after 5 hrs it again comes...He could not sleep due to nose blockage and snoring alot...I could not see his condition but I am helpless ...Not eating much food not milk...crying alot...plz help...I will attach the prescription and report hereby...