Hello, It is most probably Viral fever.. It will take time at least 3-5 days to recover. Donot worry, you can start medicine as advised below
1. Tab Dolo 650 mg three times a day for 2 days and as and when required.. Minimum duration between two dose must be 4 hrs...
2. Cold sponging if fever >101F
3. Tab Pantocid 40mg once daily
Get CBC, Blood c/s,
LFT, RFT, Urine R/M done if fever still not settled then please consult me on practo consult, he may require antibiotic... All the best