Hi., I can understand your concern
It can be due to viral infection,
You can take tab doxy 100 twice a day after food for 5 days
Tab paracetamol 650, 3 times a day after food
Tab pan 40 twice a day before food for 5 days
Next Steps
plan for CBC
widal
dengue ns1 and IgM
mp qbc
urine complete
Health Tips
avoid oily spicy processed and cold items
plan for above tests if issue persist