Welcome to HCM.
It is due to seasonal allergy
to your body.
Initially sore throat
is due to seasonal allergy but gradually secondary infection in it so pain,fever is due to infection in it.
Do warm water gargle.avoid oily,spicy and chilled cold drinks and other food.
Start anti allergic like fexofenidin with montelukast
Certain antibiotics like amoxy/clavulinic,azithromysin will be helpful.
Consult your physician and ask for these drug and further better medical management.