Hi sir , in my opinion your throat pain is because of smoking
, as well this dry dusty weather. Its not because of your bath.
In my opinion, I would suggest you to reduce smoking , drink lots of tender coconut water or any other fruits juice to keep yourself well hydrated.
Avoid eating oily and cold
items. Do salt water gargle,
If a patient with these symptoms come to my clinic
I would suggest to take some pain killers with decongestants medicine for 3 to 5 days.since your pain is recurring on and off I would also suggest penicillin antibiotics .
There is mothing to worry but do take care of yourself.