Hi welcome to the health care magic Your most probable diagnosis from history : 1.Acute pharyngitis or 2.Upper respiratory tract infection It can be viral infection as sore throat common by virus Investigation needed : CBC and ASO titre If needed antibiotic course like amoxicillin plus clavulenic acid given for three to five days For Symptomatic relief decongestant like phenylephrine or diphenhydramine can be prescribed Salt water gargle done three times a day Take vitamin C lozenges four times a day for three days Paracetamol can taken for headache Steam inhalation beneficial Drink more water Headache, exhaustion can occur in such case as a constitutional symptom Consult physician for examination and discuss all this that I have explained to you