The kind of pain you are describing could be due to many reasons, most commonest being some kind of infection or trauma. It should not last for more that 3-4 days and should improve without any treatment. Betadine
gargles will help you along with some warm saline gargles. Amon the home remedy, honey will help along with lots of vitamin C
is bad and can cause cancer too and you should stop smoking.
Hope i am able to solve your query,
Have a nice day.