Sarah, in my experience reputable hospitals and medical personnel are extremely concerned about patient pain level both pre- and post-op. They seem to be constantly coming around checking, "What is your pain level on a scale of 1-10," and so forth.

And since you seem to feel OK with your doctor, might it help to have a conversation with him/her as to your concern about the pain? And about being given enough medication to combat the pain? Could calm your fears a bit...