Any other symptoms ???
Any travel history ??
History of contact with infected/sick individual ?
If not then can be Malaria, Dengue,Viral fever etc.
Next Steps
Continuous fever monitoring
Keep the patient hydrated very well.Also can give ORS to cover the weakness factor.
Continue Dolo 650 for a week
Can also use cold water sponging if fever rises to a much higer degree.
Can get the required tests done for malaria , dengue in the nearest healthcare setup if needed.