Root canal surgery is a bit painful. From my personal experience I was into a lot pain before root canal so after I was relaxed, there were no pain medicines were there to control the pain. i have gone for rrot canal for 3 times. And the only pain is during the first sitting. After each sitting you will feel relaxed and pain will also not be there.
If you root are realy in pain and you need to have a root canal please go for a good dentist because I have suffered with lot beacuse my first root canal was not dine properly and it was painful after few years of root canal. So chosse the best dentist at your place. And trust me the pain is not much infact if you are suffering from lot of pain, you will be relaxed at the time of root canal.
Avoid ice cream till after your root canal sittings. Take the medicine properly.