We need to evaluate the tooth. Mostly it takes 5 days to get the tooth back to painless position
Secondly the first premolar gp did not reach the full length. Reason could be ledges
Also second premolar angle doesn't warrant the gp of second canal till full length.. another x ray would help
Next Steps
get another rvg done if the pain doesn't subside within 10 days
Health Tips
warm saline rinses help to release the pain
take any anti inflammatory like Chymoral forte twice daily to reduce the inflammation