Hi , I can understand your concern.
It can be due to mild respiratory tract infection.
You need to plan for antibiotics and supportive medication.
Take
Tab azee 500 once a day before food
Tab pan 40 twice a day before food
Tab montek lc at night after food
Tab paracip 659, 3 times a day after food
Syp. Ambrolite s 5ml 3 times a day after food
For 5 days.
Next Steps
plan for blood investigation if issue persist