Firstly don't be worried
Do some warm saline water gargles
Watch out out for rise in temperature.
Contact a near by physician if you develop phlegm, high temperature or breathing difficulties.
They will go blood test and maybe chest x-ray to evaluate further
For the time being, use cough lonzenges, you can even try Alex cough syrup 1 tsf thrice a day after meals. If throat itchiness persists then take cetirizine 10 mg at night for 3 days.
Consume 3 lit water every day, eat seasonal fruits.
Can take
Vitamin C also to boost immunity.