Life's Like This: Root Canal Treatment Discomfort

I have just finished a the 4 sessions of Root Canal Treatment on my lower left 3rd molar 4 days ago. I thought it went smoothly well until I felt sensitivity to pressure that lasted for a few days. Right now, I would just like to share my so called discomfort just in case someone is looking for some tips or advice on how to tackle this kind of problem if you ever get to encounter it.