A continuous high fever with severe body pain for three days usually points to an infection that requires proper evaluation rather than just symptom relief. Keep yourself well hydrated with frequent sips of water or other oral fluids, take light meals to help your body cope better, and rest as much as possible to support recovery. You can continue simple cooling measures, such as a lukewarm sponge, to ease discomfort, and avoid self-medicating beyond what has been advised, as the cause is still unclear. Try to monitor your temperature and overall condition throughout the day. If the fever remains high or if you feel increasing weakness, it needs attention. Consult a doctor promptly for proper tests and targeted treatment.