Hi. Fever with chills, headache and muscle pain is typical of a viral fever. It'll eventually settle. Main treatment is symptomatic. Take crocin advance once in 8 hours, drink plenty of water. Warning signs are severe headache, intractable vomiting, increased drowsiness and extreme weakness when you have to consult a doctor immediately. Viral fever last usually 3-4 days but it may take as long as 1 week.
Next Steps
I would like to get basic blood test CBC done.
Health Tips
Stay well hydrated and take crocin advance once in 8 hours for 3 days. Look for warning signs as mentioned and see a doctor if any. If CBC shows drop in platelets or WBC count, it is most probably viral. Follow up with your doctor with the report