Good morning, as you mentioned here that you are having dry cough, sore throat, headache, runny nose and a recent weather change are suggesting towards a viral fever.
Usually for any fever we wait for atleast 3-4 days before starting an antibiotics because if it's a viral fever it will subside by it's own without any antibiotics.
If your symptoms are not getting better or you are getting fever with chills then you need to get your blood tested for dengue and malaria.
Next Steps
Take
TAB EBAST DC 0-0-1 FOR 5 DAYS
TAB DOLO 650 SOS ( WHEN FEVER IS THERE)
ASCORIL LOZENGES 1-1-1 FOR 3 DAYS
DRINK PLENTY OF FLUIDS
STEAM INHALATION
PROPER REST
this might improve your symptoms.
Health Tips
If symptoms persists more than 4 days or if it's getting worse then get
CBC
DENGUE SEROLOGY
MPFT
and contact nine seven four one two five one zero eight four with reports for further management.